Run this on both machines.
AIDA32 - Enterprise
http://www.aida32.hu/aida32-download.php
It'll identify every chip, every device, and every card. Sounds like they may have fucked you on something.
Maybe a cheap-ass gfx card or a slower processor or something.
Unless you don't know how to clean a machine of spyware, BHOs, and virii.