Hi & welcome to the forums. Unzip HJT into it's own permanent folder before doing anything in order for it to create backups. (Not a temporary folder or directly on the desktop & not directly on your hard drive). Close all (browser) windows & rescan with hijackthis. When the scan is finished place a check in the box to the left of the following entries & click 'fix checked' :
O2 - BHO: (no name) - {9C691A33-7DDA-4C2F-BE4C-C176083F35CF} - C:\WINDOWS\SYSTEM\BRIDGE.DLL
O2 - BHO: (no name) - {83DE62E0-5805-11D8-9B25-00E04C60FAF2} - C:\WINDOWS\2_0_1browserhelper2.dll
O4 - HKLM\..\Run: [RunDLL] rundll32.exe "C:\WINDOWS\SYSTEM\BRIDGE.DLL",Load
O4 - HKLM\..\Run: [systray] C:\WINDOWS\SYSTEM\A.EXE
O4 - HKLM\..\Run: [arkp] C:\WINDOWS\arkp.exe
Reboot into safe mode following the instructions here & navigate to & delete the following if found:
C:\WINDOWS\SYSTEM\BRIDGE.DLL< file
C:\WINDOWS\SYSTEM\A.EXE< file
C:\WINDOWS\arkp.exe< file
Reboot normally after doing the above then post a fresh log plz.