TheTopBanana:
Try doing ScottHope's "Reset" (see above). Then launch WGT and log in using your main account (the one you've been using for years). That will probably solve your problem.
Once you're able to log in and play using your main account, you should contact WGT and have them delete your new account (TheTopBanana). WGT frowns on people having multiple accounts.
MioKontic: And what do you mean when you say you granted full access to files through properties?
I'm pretty sure he means that he right-clicked the WGT files (i.e. launcher.exe and/or golf.exe), selected Properties, then went to the Security tab and set the Permissions to Full Control.