lawrencehare.

The main reason I bought the Professional version of Win 7, was for the 'Compatability' option.

If you have an *.exe program which Win 7 Prof says it cannot load, you just right click the exe prog and select 'Troubleshoot Compatability', then follow the popup instructions.

Have used it many times for older wi fi adaptors etc. etc.  Very, very useful.

There is a couple of options in the Ultimate but not in the Prof, but nothing that I couldn't do without.

I wish you luck with HP.