I'd bet you trashed your Registry - unless you know what you're doing there it's cheaper time-wise just to reinstall Bryce. Not too long ago I was working with DX6 or DX7 sdk and I made the mistake og installing a part of the SDK that overwrote my HAL settings - I had to boot by F10 to completely reinstall XP. it took 10 hours and all my associations were trashed.It took weeks to get my computer back in line and in the meantime one of my best friends died of cancer, my mother got sick and I had to start caretaking for her my landlady started acting like a monster from hell, George Noorey started boring me, they took Star Trek Enterprise off the air ... well you get the idea. The moral of the story is don't press the F10 button even in an emergency; either that or reinstall Bryce. If its a formatting problem I.E. you might have reformatted the disk to FAT-32 on a NTFS system. I hear that is possible and creates lots of probles but then you'd have bigger problems than Bryce not working.