Hmm, Just a thought.
I was using Vista to copy some files to my portable HDD so I could get them on my Mac. It took about 10 min to copy the files which were of a hefty size (About 500 mb). They were video files too. Now, to copy them to my mac, it took 1 min to copy them and about 6 to convert them into something iMovie could understand. Hmm, this tells me something
(OK, I admit it. The Mac is newer hardware. (Core 2 Duo) Vista is (2.0GHz Pentium 4) Still, something on the vista computer was chewing up CPU cycles. Something called svchost.exe and dwm.exe )