Many earlier programs refuse to run in Win7 because DEP kicks them out without even a message apology or solution. Buy a new one type stuff.
DEP is Data Execution Prevention.
When a program won't run and Win7 just says incompatible program this often fixes the problem.
It is MY computer and I will do what I like with IT!!!
Damned hidden stuff.
DEP can be disabled readily by adding the program to a list.
Start, Computer,
Right click properties
Advanced system settings
Settings (performance)
Third tab Data Execution Prevention
Add the program to the list.
Many win98/XP PIC utilities will perfectly run once entered here.
Interestingly, ACAD.exe adds itself to the DEP list.
And DOSBOX is the best, running VESA mode video stuff from 20 years ago at stunning speeds.
Super X3. 3600rpm. Sheridan 6"x24" Lathe + more. Three ways to fix things: The right way, the other way, and maybe your way, which is possibly a faster wrong way.