I'm getting message boxes entitles "Invalid Instruction" in a FoxPro 2.6 DOS app.

For details, I have gotten:
Fault Location: 6060:083E
Interupts in Service: None
and
Fault Location: 609F:044E
Interupts in Service: None

When I click the OK button, I get kicked out of the app.

My user's PC is set up as follows:
Win 95 4.00.950B Plus!
Pentium chip (don't know how fast)
32 MB of RAM

Any one have an idea what my trouble is?