Vista’s UAC Blocks Rootkits
Several months ago the highly-respected AV-Test.org ran a test to rank various antivirus applications. In that test they had 30 rootkits that were tested on both Windows XP and Vista. On Windows XP none of the seven antivirus suites could detect all of the rootkits, and only four of the 14 anti-rootkit tools proved to be 100% successful. Those aren't very good odds.


