In article 9DFDEA9A-DF47-422B-8EE6-CD21745E5614
@microsoft.com, says...
It could be the video card. Check this post.

RDC fails because of video card
Recently, i updated ATI video drivers to the latest version and Remote
Desktop stopped working with exactly the same symptoms. Looks like ...
http://www.chicagotech.net/netforums...pic.php?t=4532



Both laptops have the same Nvidia graphics chip. The only
difference is that the one that cannot connect has more
video ram. They both run the same driver, so I don't think
that's causing the problem.