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 (in a folder on the desktop is fine) & 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) - {6DDD6520-BC6D-289A-D756-62557FA32739} - C:\WINDOWS\System32\keqxrja.dll
O4 - HKCU\..\Run: [Smob] C:\Documents and Settings\paul\Application Data\ttdu.exe
O4 - HKCU\..\Run: [Fzhvywxp] C:\WINDOWS\System32\fvqg.exe
O16 - DPF: {8F24DE00-0D66-4F93-9405-3F21E97AEE99} (TestingCtl Control) - http://esb.alcena.com/ESBAdultInstaller.ocx
Reboot into safe mode following the instructions here & navigate to & delete the following if found:
C:\Documents and Settings\paul\Application Data\ttdu.exe
C:\WINDOWS\System32\fvqg.exe
Reboot normally.
Try the PurityScan uninstaller.
Go here for an on-line scan & set it to autoclean for you.
Try this scan as well.