Malware infection, remove using the following
Malwarebytes Anti-Malware
http//www.download.com/Malwarebytes-Anti-Malware/3000-8022_4-10804572.html?hhTest=1.
Download, install, update and select Full Scan.
Remove all infections that it finds after scan.
Spybot S&D
http//www.safer-networking.org/en/download/index.html
Download, install, update and Immunize, turn off Tea Timer then click 'Check for problems' then when complete select all and then 'Fix Checked'
Spyware Doctor Free Basic Edition - Realtime monitoring
http//pack.google.com/intl/en/pack_installer_new.html?hl=en&gl=us&ciNum=12
Its free with Google pack, untick all boxes except Spyware Doctor. Download install, update and run.
SmitFraud Removal
Firstly, download the removal tool from here
http//siri.urz.free.fr/Fix/SmitfraudFix.exe
How to use
http//cotojo.wordpress.com/2007/08/24
SUPERAntiSpyware Free Edition
http//www.download.com/SUPERAntiSpyware-Free-Edition/3000-8022_4-10523889.html
Download, install, check for updates, then select Scan your Computer, select your drive and select Perform Complete Scan
VundoFix
http//www.symantec.com/content/en/us/global/removal_tool/threat_writeups/FixVundo.exe
Disconnect your computer from the internet
Run vundo
Restart your computer
Run the tool again to ensure no traces are left.
If there are the reboot into Safe Mode and run FixVundo again.
If your desktop has changed or icons are missing also use
Wallpaper Hijacker Removal Tool
http//www.majorgeeks.com/Wallpaper_Hijack_Remover_d4816.html
Note You should hit all "Repair" buttons even though it may not say "Found!" This will fix a wallpaper hijack everytime if all repair buttons are pressed.
A-Squared Free
http//www.download.com/A-squared-Free/3000-2239_4-10262215.html
This is not a limited version but a full tool to clean your computer from Malware, Spyware, Trojans, Backdoors, Worms, Dialers and Keyloggers.
How to use
http//cotojo.wordpress.com/2008/07/07
If the problem persists, turn OFF System Restore and scan with the above programs in Safe Mode, Right click My computer > select Properties > System Restore Tab > Tick Turn Off System restore on all drives.
After scans are complete and machine is clean remember to turn system restore back ON and create a new restore point.
Once your scans are complete and your machine is clean, uninstall some of the programs, I suggest that you keep Malwarebytes for manual scanning, Spyware Doctor for realtime monitoring and Spybot. The remainder can be removed to save drive space, but you may want to keep the installers for future use.
Scan online with Housecall
http//housecall.trendmicro.com
or BitDefender;
http//www.bitdefender.com/scan8/ie.html
or F-Secure
http//support.f-secure.com/enu/home/ols.shtml