How 2 get round a "not a valid win32 application" error message?

This is a fix for anyone with a problem with Sims2 applications.
when you try to install some Sims2 programs such as Freetime, the following appears:
D:not a valid win32 application

To get round this, start the computer in safe mode, click start,run autorun.exe then the computer will install the game,when complter just restart pc and carry on ......