Quote Originally Posted by Thulos',index.php?page=Thread&postID=71721#post717 21]There is a sticky detailing what causes this:

[url='http://www.dual-boxing.com/forums/index.php?page=Thread&threadID=2175
Horizontal Span vs Dual View on nvidia[/url]
That issue only applies to XP. This does sound like pretty much the same problem, but there is no horizontal span to pick on Vista anyway so it won't really help him.