Weird, when I right-click on the link for LimeWire (or BitTorrent) and choose 'run as administrator' it does seem to work. Albeit more slowly than otherwise, on XP I get up to Turbocharged speed, in Vista only up to Fair Connection.

But I am logged on as an Administrator, so why won't it work when I simply double-click the application? Maybe the next versions of these programmes need to be further optimised for Vista?