We all know how important the GMATPrep is. After all, it's the only official question prep from the GMAC. Unfortunately, you can only take the test twice - that is, until you reset the program. And how do you do that? Easily apparently. This information was taken from GMATClub.com.
I've actually found a much easier way to get past the GMAT install issue.
All you have to do is go to: C:\Program Files\GMATPrep\exams
make a folder in there called old_exams_set1
These files only exist if you took the exams... put them in old_exams_set1
Then just go back to C:\Program Files\GMATPrep\exams and delete
Now the software is "reset" and doesnt know you've taken the exams.