You need to "allow indexing on this folder" for the gpl folder, otherwise
you'll get a CTD (crash to desktop) when you try to start gpl. This may well
be your only problem.
To do this, browse to the gpl folder, right click on it & select properties
& click the advanced button. You'll see a tickbox for indexing, that's very
probably blank. Tick that & try running gpl again.
If you've copied the directory from the CD or another location, you could
uncheck the read only attribute at the same time. Make sure you choose the
option to change all subfolders & files for both of these changes.
Malc.