Their are only two possible things I can say to do is to; First is to completely throw away that old "Gibbed's Save Editor", download it again here "Heres The Link", And if you run that program without running it as an Administrator their might be issues especially with Windows XP. Even now with the Windows 7 that I use I always run every program as an Administrator.
The second thing I would do is right click the Gibbed Save Editor Program, to go Properties, Compatibility, and changing the Service Pack to 3 or even 2 for Windows XP, And at the bottom it will say "Run this program as an Administrator", Check that box and click apply. Once that's done just double click on the program and see if it works now.
If those did not help you please PM asap and Ill work on getting you an answer my friend.
The second thing I would do is right click the Gibbed Save Editor Program, to go Properties, Compatibility, and changing the Service Pack to 3 or even 2 for Windows XP, And at the bottom it will say "Run this program as an Administrator", Check that box and click apply. Once that's done just double click on the program and see if it works now.
If those did not help you please PM asap and Ill work on getting you an answer my friend.