Crash on file open (*.skf)

I have Autosketch 9 which runs great on Win 2000. However when I switched to XP SP2, it crashes whenever I open a file.
I uninstall the program and reinstall, I can then open and work on ONE file successfully for as long as I want. If I try to open another file or even the same file at a later time, Autosketch tells me an unknown error has occured and the program must be shut down. So it goes on , uninstalling and reinstalling many times per day.
any ideas appreciated.
Thanks

 

I'm running it on XP with no problems;
Try un-installing it, deleting an relevant registry settings and then re-installing it?

{Note: don't pla with the registry unless you know what you are doing, and always back it up.}