You need to download and edit vars_config.cgi. Once you fix the paths, upload and it should work. If you cannot get it to work, you will probably want
Groupee Support to help you further as it will require FTP Access to fix your boards.
On a side note, this particular forum is reserved for Suggestions for Modifications, not I've been hacked posts. You would probaby want to post these type of questions down in New Member Questions in the future