Turn off System Restore, restart in safe mode, run Hijackthis and remove the following.
O2 - BHO: ATLDistrib Object - {2353FCBC-012D-487B-8BF3-865C0929FBEB} - C:\WINDOWS\system32\jkkji.dll
O20 - Winlogon Notify: jkkji - C:\WINDOWS\system32\jkkji.dll
Re-enable System Restore. Rebbot to normal mode.
Protect your computer, absolute minimum...
1 x Antivirus software running realtime protection.. AVG
1 x Antispyware software running realtime protection.. Microsoft Antispyware
1 x Firewall, a better one than XP.