Restart HijackThis and put checks next to the following, close all browser windows (including this one) then click on 'Fix Checked'

O2 - BHO: SDWin32 Class - {A0D771F8-9E44-4459-94AB-EC658413B437} - C:\WINDOWS\System32\gqkvk.dll
O2 - BHO: Core Library - {D4D505DF-D582-400c-91B6-84921012AFE3} - C:\WINDOWS\System32\PDF5ef2.dll

Make sure you have Set Windows to show Hidden Files & Folders, then reboot into safe mode then delete:

C:\WINDOWS\System32\gqkvk.dll <-------- Delete this file.
C:\WINDOWS\System32\PDF5ef2.dll <-------- Delete this file.
C:\Program Files\SEP <-------- Delete this folder.

Reboot. Click here to make sure that you have the latest patches for Windows. Click here to get the latest version of Internet Explorer. It's very important to keep your system up to date to avoid unnecessary security risks.

Post back with another HijackThis log and let us know how things are running.