Hey MagicAndre, I followed your very instructive method and got to the bottom of it (BTW, might be interesting to point out that one needs to de-select all in a custom install of the SDK, and then only select Development Tools - including the .NET part. Then it's only a 400Mb download). My problem now lies in the fix. I am running W7 64-bit on a 27" iMac (late 2009 model) on a Core i7 (quad) using Bootcamp 3.0 with OSX SL 10.6.. I'm currently downloading the 3.1 update of Bootcamp, but am not hopeful that it will solve my problem. The process you described yielded the very clear finding that ACPI.sys is causing the pb: This is using up a full processor out of my 4 processors 100% of the time... My iMac is red-hot. Now I have cruised the forums all over the place, but nobody has identified this particular problem with Boocamp on this iMac, although similar problems point to the fact that one should disable ACPI compatibility stuff. My problem? My Windows 7 won't let me do that. I just don't get the Remove or Disable buttons when I go to these devices. I can't go in BIOS either as there is no BIOS, it's Bootcamp. I'm at a loss here. Just to be quite complete: I'm running Windows with Bootcamp, but also have VMware installed on the machine, using the Bootcamp intall when in OSX. I've tried disabling the VMWare stuff while in native W7 mode, but it doesn't change anything. Any pointers? (It's extremely rare that I post a question, usually the answer is already somewhere. In this case, it isn't, or I'm really not looking right.)