I had the error that stated:
In the Parallels User Guide it has some info about this error:
When I did this, I had driver.cab on my XP disc, but I did not have sp1.cab or sp2.cab. If I copied driver.cab and tried Parallels, I got the same error. I fixed it by locating another copy of an XP install disc, and digging in the disc to find the sp2.cab file, dropping it in to the i386 folder, and trying Parallels. After I did that, Parallels Desktop functioned exactly how it should with my Boot Camp partition. I'm not too sure why my disc doesn't have that file. It's an XP Pro Corporate Edition, SP2.
Either way, my successful steps were these:
1. Boot directly to XP via Boot Camp
2. Copy sp2.cab from XP disc (or
download it perhaps) to C:/windows/driver cache/i386
3. Reboot back to Mac OS X
4. Set up Parallels Desktop to use Boot Camp
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