Follow the instructions in the link below. After running the first tool, then uninstall Winfixer from the Control Panel/Add-Remove Programs section, IF it's there.:
Removal Tool - Adware-Virtumundo/WinFixer Popups
OR, if that doesn't get it done...
Hope this helps.
Lately I have been getting Winfixer popups and i use Trend Micro SpySubtract to try to remove it, but it doesn't work. I know that it catches it, but it doesnt permantly remove the spyware. I currently have a HP Pavilion a1019h, which I purchased at the end of last year. I also tried using Spybot Search and Destroy, but all I get a bunch of errors. My antivirus protection is from Verizon Yahoo DSL. Could you please help me remove this ware from my computer.