I've seen a few posts on how to do this, but the following is the only way I could get it done.

  1. Right Click the Adobe 8 executable (AdbeRdr80_en_US.exe)
  2. Click on the "Compatibility" tab
  3. Check the box under "Compatibility mode" for "Run this program in.....
  4. Choose "Windows XP (Service Pack 2)
  5. Click OK

Now go back and run the Adobe executable and the install should go.