Windows Live OneCare v2.0 subscription licence and media, £11.87

Windows Live OneCare is the all-in-one PC security and performance service designed specifically for Windows XP and Windows Vista-based operating systems.

It helps keep your PC's internal workings in order and protect it from outside security threats.

Product Features
All-in-one security from Microsoft protects personal and financial documents from the latest viruses, worms, hackers, spyware, and online identity scams
Automate "janitorial tasks," including disk cleaning and defragmentation, to help improve PC performance
Easily back up your files to a CD, DVD, external hard drive, locally networked computers, or most USB-connected storage devices
Protect your PC from outside security threats while keeping things on the inside running smoothly
Works with Microsoft Update to help ensure that your computer is up-to-date with the latest security and critical updates

You can purchase the software at Ebuyer for only £11.87 delivered