In Test, Windows 7 Vulnerable To 8 Out of 10 Viruses
As Windows 7's market share passes 3.6%, up from 1.9% the day before launch,
llManDrakell notes an experiment they did over at Sophos. They installed Windows 7 on a clean machine — with no anti-virus protection — with User Access Control in its default configuration. They threw at it the next 10 virus/worm samples that came in the door. Seven of them ran; UAC stopped only one baddie that had run in the absense of UAC. "Lesson learned? You still need to run anti-virus on Windows 7."
And by the same token, getting the programs you need to run (which were designed for Windows) on Linux requires far more finagling, assuming you can get them to run at all. Seems we're at an impasse.