As a preliminary and educated guess, try browsing to ...
C:\Documents and Settings\{your XP account name}\Application Data\.BitTornado
and deleting all files and folders you see there. You might like to copy the config.gui.inf file first to another folder, as this contains your settings. You should also backup any torrent files stored in the folders there that you might like to keep.
so,
1,delete those files and copy your settings file back there, and see if you still have the problem by simply starting the application and seeing if it works.
2, if it still freezes, delete it all again, including the settings file (you don't have to delete any backup you make though), and see if it works without freezing now.
Please let us know either way.
C:\Documents and Settings\{your XP account name}\Application Data\.BitTornado
and deleting all files and folders you see there. You might like to copy the config.gui.inf file first to another folder, as this contains your settings. You should also backup any torrent files stored in the folders there that you might like to keep.
so,
1,delete those files and copy your settings file back there, and see if you still have the problem by simply starting the application and seeing if it works.
2, if it still freezes, delete it all again, including the settings file (you don't have to delete any backup you make though), and see if it works without freezing now.
Please let us know either way.