Can't reinstall parallels tools

Based on one of the threads here in the forum I uninstalled Parallels tools using the Windows control panel. When I try to install it I get dozens of "can't install pci device" errors caused when Parallels runs the found new hardware wizzard (I'm not kidding, dozens.) Any suggestions on how to get parallels tools back?

I'm running on a Mac Pro with 16GB of RAM and lots of hard drive space. I'm running Windows XP. I had a parallels technician set my configuration up, and it was working okay when I took Parallels tools off, except for garbled audio. I'm willing to live with the garbled audio, I just need all of the Parallels tools features. Without Parallels tools, it's just bootcamp in a window.