DBC
is compatible with XP, so that's not your problem.
Try re-downloading it, it sounds like you have a corrupt file there.
I suggest not using any download accelerators as they can sometimes corrupt files ( although, not very often ). If downloading it again causes the same problems, try getting the Lite version, and see if that works, if it does, then there was a problem with the download of the Trial, If it doesn't, then there is a problem with you downloading files from TGC's server...
You might need to contact Rich if that is the case.
Hope I Helped...

Team EOD :: Programmer/Logical Engineer/All-Round Nice Guy