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Rerun HJT,and put a checkmark beside these :-

O4 - HKLM\..\Run: [] C:\WINDOWS\System32\intenat.exe

now close all windows and browsers and click FIX CHECKED

I suggest you uninstall Authentium anti virus, you already have PCGUARD installed, running 2 can cause problems.

then :-

Please download ComboFix from either of these two locations

BleepingComputerComboFix
geeks to go combofix

* Double click combofix.exe & follow the prompts.
* When finished, it shall produce a log for you. Post that log in your next reply

Do not mouseclick combofix's window whilst it's running. That may cause it to stall.

Post back with the log from ComboFix and a new HJT log please.