Vista / WinXP
It works quietly in the background on your computer, so you don't have to worry about nasty interruptions from viruses, spyware, hackers, and other unwanted intruders. It also goes beyond security, regularly backing up all your important files and cleaning up and tuning up your computer to help keep it running at top speed.
You need to have atleast Windows XP service pack 2 installed if your installing Microsoft Windows Live OneCare to Windows XP operating system
microsoft windows live onecare microsoft windows live onecare spyware virus
1License and operating system information is based on latest version of the software.