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dentate - make sure your OS is selected as Vista within Parallels
Also, you will need to rename your c:\windows\system32\hal.dll to hall_std.dll and copy your c:\windows\servicepackfiles\i386\halacpi.dll to...
That's easy, just Google HAL2.INF and find an entry that talks about cloning windows and after you make the inf, you can update the "Standard PC"...
Parallels team working on ACPI upgrade fix... Got word from them today, they are working on the problem and should have a fix soon.