WinXP!!!! Help!

I just purchased Windows XP, and Installed it. It 'works', but I cannot run ANY of my old programs! The 'Compatabuility Checker' allways says they are 'OK', but then they just say "Send Error Report". The wierdest thing of all is I've run all of these programs on other XP machines.... Mine is also stranglely slow (Even though my machine is faster than one I saw it run fast on!).

Please Help! SPH

um... did you update all of your drivers and or the OS?

did you install or update? With the update everything's slower...and try running your programs with Win98/ME compatibility.