Run Hijackthis and select "Do a system scan only", place a check by the following entries.
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName =
O4 - HKCU\..\Run: [mzri] C:\PROGRA~1\COMMON~1\mzri\mzrim.exe
O9 - Extra button: PartyPoker.com - {B7FE5D70-9AA2-40F1-9C6B-12A255F085E1} - C:\Program Files\PartyGaming\PartyPoker\RunApp.exe
O9 - Extra 'Tools' menuitem: PartyPoker.com - {B7FE5D70-9AA2-40F1-9C6B-12A255F085E1} - C:\Program Files\PartyGaming\PartyPoker\RunApp.exe
O16 - DPF: {205FF73B-CA67-11D5-99DD-444553540013} (CInstall Class) - http://adserver.sharewareonline.com/...er/Install.cab
Close all open windows and browsers, and hit "Fix Checked".
Delete this folder.
C:\PROGRAM FILES\COMMON FILES\
mzri
Reboot and post a new Hijackthis log, and say how things are now.