Could someone please spare the time to give this a quick scan to see if there is anything untoward.
Many thanks.

vaaLogfile of HijackThis v1.99.1
Scan saved at 18:44:18, on 13/02/2008
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP2 (6.00.2900.2180)

Running processes:
C:\WINDOWS\System32\smss.exe
C:\WINDOWS\system32\winlogon.exe
C:\WINDOWS\system32\services.exe
C:\WINDOWS\system32\lsass.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\ZoneLabs\vsmon.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\system32\spoolsv.exe
C:\PROGRA~1\Grisoft\AVGFRE~1\avgamsvr.exe
C:\PROGRA~1\Grisoft\AVGFRE~1\avgupsvc.exe
C:\PROGRA~1\Grisoft\AVGFRE~1\avgemc.exe
C:\WINDOWS\system32\CTsvcCDA.EXE
C:\Program Files\SiteAdvisor\6253\SAService.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\system32\MsPMSPSv.exe
C:\Program Files\Alcatel\SpeedTouch USB\Dragdiag.exe
C:\Program Files\Dell\Media Experience\PCMService.exe
C:\WINDOWS\system32\Rundll32.exe
C:\Program Files\Intel\Modem Event Monitor\IntelMEM.exe
C:\Program Files\CyberLink\PowerDVD\DVDLauncher.exe
C:\WINDOWS\system32\dla\tfswctrl.exe
C:\Program Files\Creative\Sound Blaster Live! 24-bit\Surround Mixer\CTSysVol.exe
C:\PROGRA~1\Yahoo!\browser\ybrwicon.exe
C:\WINDOWS\system32\igfxpers.exe
C:\Program Files\Adobe\Photoshop Album Starter Edition\3.0\Apps\apdproxy.exe
C:\PROGRA~1\Grisoft\AVGFRE~1\avgcc.exe
C:\Program Files\SiteAdvisor\6253\SiteAdv.exe
C:\Program Files\btbb_wcm\McciTrayApp.exe
C:\PROGRA~1\BTBROA~1\SMARTB~1\BTHelpNotifier.exe
C:\PROGRA~1\Yahoo!\YOP\yop.exe
C:\Program Files\Zone Labs\ZoneAlarm\zlclient.exe
C:\Program Files\Dell Photo AIO Printer 922\dlbtbmgr.exe
C:\Program Files\Messenger\msmsgs.exe
C:\Program Files\DellSupport\DSAgnt.exe
C:\Program Files\IE New Window Maximizer\iemaximizer.exe
C:\Documents and Settings\All Users\Application Data\Dell\TransferAgent\TransferAgent.exe
C:\PROGRA~1\Yahoo!\browser\ycommon.exe
C:\Program Files\Dell Photo AIO Printer 922\dlbtbmon.exe
C:\Program Files\BT Broadband Desktop Help\bin\mpbtn.exe
C:\PROGRA~1\Yahoo!\YOP\SSDK02.exe
C:\WINDOWS\system32\wuauclt.exe
C:\Program Files\Internet Explorer\iexplore.exe
C:\Program Files\HijackThis\HijackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://www.dell.co.uk/myway
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar = http://uk.red.clientapps.yahoo.com/custo...fo/bt_side.html
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = http://uk.red.clientapps.yahoo.com/customize/btyahoo/defaults/sp/*http://uk.search.yahoo.com/
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.btinternet.com/
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = http://uk.red.clientapps.yahoo.com/customize/btyahoo/defaults/su/*http://uk.search.yahoo.com/
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Bar = http://uk.red.clientapps.yahoo.com/custo...fo/bt_side.html
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = http://uk.red.clientapps.yahoo.com/customize/btyahoo/defaults/sp/*http://uk.search.yahoo.com/
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://home.bt.yahoo.com
R1 - HKCU\Software\Microsoft\Internet Explorer\SearchURL,(Default) = http://uk.red.clientapps.yahoo.com/customize/btyahoo/defaults/su/*http://uk.search.yahoo.com/
O2 - BHO: Yahoo! Companion BHO - {02478D38-C3F9-4efb-9B51-7695ECA05670} - C:\Program Files\Yahoo!\Companion\Installs\cpn\ycomp5_5_7_0.dll
O2 - BHO: Adobe PDF Reader Link Helper - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 7.0\ActiveX\AcroIEHelper.dll
O2 - BHO: (no name) - {089FD14D-132B-48FC-8861-0048AE113215} - C:\Program Files\SiteAdvisor\6253\SiteAdv.dll
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\Program Files\Spybot - Search & Destroy\SDHelper.dll
O2 - BHO: UberButton Class - {5BAB4B5B-68BC-4B02-94D6-2FC0DE4A7897} - C:\PROGRA~1\Yahoo!\Common\yiesrvc.dll
O2 - BHO: DriveLetterAccess - {5CA3D70E-1895-11CF-8E15-001234567890} - C:\WINDOWS\system32\dla\tfswshx.dll
O2 - BHO: YahooTaggedBM Class - {65D886A2-7CA7-479B-BB95-14D1EFB7946A} - C:\PROGRA~1\Yahoo!\Common\YIeTagBm.dll
O2 - BHO: ZoneAlarm Spy Blocker BHO - {F0D4B231-DA4B-4daf-81E4-DFEE4931A4AA} - C:\Program Files\ZoneAlarmSB\bar\1.bin\SPYBLOCK.DLL
O2 - BHO: SidebarAutoLaunch Class - {F2AA9440-6328-4933-B7C9-A6CCDF9CBF6D} - C:\Program Files\Yahoo!\browser\YSidebarIEBHO.dll
O3 - Toolbar: Yahoo! Companion - {EF99BD32-C1FB-11D2-892F-0090271D4F88} - C:\Program Files\Yahoo!\Companion\Installs\cpn\ycomp5_5_7_0.dll
O3 - Toolbar: McAfee SiteAdvisor - {0BF43445-2F28-4351-9252-17FE6E806AA0} - C:\Program Files\SiteAdvisor\6253\SiteAdv.dll
O3 - Toolbar: ZoneAlarm Spy Blocker - {F0D4B239-DA4B-4daf-81E4-DFEE4931A4AA} - C:\Program Files\ZoneAlarmSB\bar\1.bin\SPYBLOCK.DLL
O4 - HKLM\..\Run: [UpdateManager] "C:\Program Files\Common Files\Sonic\Update Manager\sgtray.exe" /r
O4 - HKLM\..\Run: [SpeedTouch USB Diagnostics] "C:\Program Files\Alcatel\SpeedTouch USB\Dragdiag.exe" /icon
O4 - HKLM\..\Run: [PCMService] "C:\Program Files\Dell\Media Experience\PCMService.exe"
O4 - HKLM\..\Run: [P17Helper] Rundll32 P17.dll,P17Helper
O4 - HKLM\..\Run: [IntelMeM] C:\Program Files\Intel\Modem Event Monitor\IntelMEM.exe
O4 - HKLM\..\Run: [DVDLauncher] "C:\Program Files\CyberLink\PowerDVD\DVDLauncher.exe"
O4 - HKLM\..\Run: [dla] C:\WINDOWS\system32\dla\tfswctrl.exe
O4 - HKLM\..\Run: [CTSysVol] C:\Program Files\Creative\Sound Blaster Live! 24-bit\Surround Mixer\CTSysVol.exe /r
O4 - HKLM\..\Run: [YBrowser] C:\PROGRA~1\Yahoo!\browser\ybrwicon.exe
O4 - HKLM\..\Run: [igfxtray] C:\WINDOWS\system32\igfxtray.exe
O4 - HKLM\..\Run: [igfxpers] C:\WINDOWS\system32\igfxpers.exe
O4 - HKLM\..\Run: [Adobe Photo Downloader] "C:\Program Files\Adobe\Photoshop Album Starter Edition\3.0\Apps\apdproxy.exe"
O4 - HKLM\..\Run: [PC Pitstop Optimize Scheduler] C:\Program Files\PCPitstop\Optimize\PCPOptimize.exe -boot
O4 - HKLM\..\Run: [AVG7_CC] C:\PROGRA~1\Grisoft\AVGFRE~1\avgcc.exe /STARTUP
O4 - HKLM\..\Run: [SiteAdvisor] C:\Program Files\SiteAdvisor\6253\SiteAdv.exe
O4 - HKLM\..\Run: [btbb_wcm_McciTrayApp] C:\Program Files\btbb_wcm\McciTrayApp.exe
O4 - HKLM\..\Run: [Motive SmartBridge] C:\PROGRA~1\BTBROA~1\SMARTB~1\BTHelpNotifier.exe
O4 - HKLM\..\Run: [YOP] C:\PROGRA~1\Yahoo!\YOP\yop.exe /autostart
O4 - HKLM\..\Run: [ZoneAlarm Client] "C:\Program Files\Zone Labs\ZoneAlarm\zlclient.exe"
O4 - HKLM\..\Run: [Dell Photo AIO Printer 922] "C:\Program Files\Dell Photo AIO Printer 922\dlbtbmgr.exe"
O4 - HKCU\..\Run: [MSMSGS] "C:\Program Files\Messenger\msmsgs.exe" /background
O4 - HKCU\..\Run: [DellSupport] "C:\Program Files\DellSupport\DSAgnt.exe" /startup
O4 - HKCU\..\Run: [IE New Window Maximizer] C:\Program Files\IE New Window Maximizer\iemaximizer.exe
O4 - HKCU\..\Run: [Yahoo! Pager] C:\Program Files\Yahoo!\Messenger\ypager.exe -quiet
O4 - HKCU\..\Run: [DellTransferAgent] "C:\Documents and Settings\All Users\Application Data\Dell\TransferAgent\TransferAgent.exe"
O4 - Global Startup: Adobe Reader Speed Launch.lnk = C:\Program Files\Adobe\Acrobat 7.0\Reader\reader_sl.exe
O4 - Global Startup: BT Broadband Desktop Help.lnk = C:\Program Files\BT Broadband Desktop Help\bin\matcli.exe
O8 - Extra context menu item: Download Video - http://www.viloader.net/addon.htm
O8 - Extra context menu item: Download with GetRight - C:\Program Files\GetRight\GRdownload.htm
O8 - Extra context menu item: Open with GetRight Browser - C:\Program Files\GetRight\GRbrowse.htm
O9 - Extra button: BT Yahoo! Services - {5BAB4B5B-68BC-4B02-94D6-2FC0DE4A7897} - C:\PROGRA~1\Yahoo!\Common\yiesrvc.dll
O9 - Extra button: (no name) - {CD67F990-D8E9-11d2-98FE-00C0F0318AFE} - (no file)
O9 - Extra button: (no name) - {e2e2dd38-d088-4134-82b7-f2ba38496583} - %windir%\Network Diagnostic\xpnetdiag.exe (file missing)
O9 - Extra 'Tools' menuitem: @xpsp3res.dll,-20001 - {e2e2dd38-d088-4134-82b7-f2ba38496583} - %windir%\Network Diagnostic\xpnetdiag.exe (file missing)
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O16 - DPF: {0E5F0222-96B9-11D3-8997-00104BD12D94} (PCPitstop Utility) - http://www.pcpitstop.com/pcpitstop/PCPitStop.CAB
O16 - DPF: {30528230-99f7-4bb4-88d8-fa1d4f56a2ab} (Installation Support) - C:\Program Files\Yahoo!\Common\Yinsthelper20073151.dll
O17 - HKLM\System\CCS\Services\Tcpip\..\{BF4C5A10-1911-49AD-9D07-302C1C0F86AF}: NameServer = 62.6.40.162 194.74.65.69
O18 - Protocol: siteadvisor - {3A5DC592-7723-4EAA-9EE6-AF4222BCF879} - C:\Program Files\SiteAdvisor\6253\SiteAdv.dll
O20 - Winlogon Notify: igfxcui - C:\WINDOWS\SYSTEM32\igfxdev.dll
O20 - Winlogon Notify: WgaLogon - C:\WINDOWS\SYSTEM32\WgaLogon.dll
O21 - SSODL: WPDShServiceObj - {AAA288BA-9A4C-45B0-95D7-94D524869DB5} - C:\WINDOWS\system32\WPDShServiceObj.dll
O23 - Service: AVG7 Alert Manager Server (Avg7Alrt) - GRISOFT, s.r.o. - C:\PROGRA~1\Grisoft\AVGFRE~1\avgamsvr.exe
O23 - Service: AVG7 Update Service (Avg7UpdSvc) - GRISOFT, s.r.o. - C:\PROGRA~1\Grisoft\AVGFRE~1\avgupsvc.exe
O23 - Service: AVG E-mail Scanner (AVGEMS) - GRISOFT, s.r.o. - C:\PROGRA~1\Grisoft\AVGFRE~1\avgemc.exe
O23 - Service: Creative Service for CDROM Access - Creative Technology Ltd - C:\WINDOWS\system32\CTsvcCDA.EXE
O23 - Service: dlbt_device - Dell - C:\WINDOWS\system32\dlbtcoms.exe
O23 - Service: DSBrokerService - Unknown owner - C:\Program Files\DellSupport\brkrsvc.exe
O23 - Service: Intel NCS NetService (NetSvc) - Intel(R) Corporation - C:\Program Files\Intel\PROSetWired\NCS\Sync\NetSvc.exe
O23 - Service: SiteAdvisor Service - Unknown owner - C:\Program Files\SiteAdvisor\6253\SAService.exe
O23 - Service: TrueVector Internet Monitor (vsmon) - Zone Labs, LLC - C:\WINDOWS\system32\ZoneLabs\vsmon.exe
O23 - Service: YPCService - Yahoo! Inc. - C:\WINDOWS\system32\YPCSER~1.EXE