You can try run the program that has error in it, if it doesn't occur again, it should be fixed

A simply calculator is, yes. However some calculators can also be programmed in a rudimentary fashion.

no the prom is fixed it only resets ( program read only memory)

I fixed the problem by deleted the program 'Spyware Doctor' using the add or remove program Icon in Control Panel. Once I rebooted the computer, the problem was gone.

Debugging is the often tedious process of locating and fixing the causes of incorrect behavior in a computer program. Although often tedious it can be quite exciting and fun when the problems are all fixed and the program does what it was supposed to do.