Hi BobEdge,

If you do not have a virus and you are sure; becasue viruses love dos compatible *.exe files, then I can only think of compatibility issue.

1. Find pbpw.exe under your PBP directory.
2. Right click it => properties => compatibility.
3. "Check" the box where it says run this with Windows 95 compatible mode.

But still, your problem seems that you have a virus.