[Help] registration page error

After registering the first account im getting this error. Ive done a RaGezone search and a Google search, and it seems like no one found the solution...

Warning: mssql_query() [function.mssql-query]: message: Violation of PRIMARY KEY constraint 'PK_MEMB_INFO_1'. Cannot insert duplicate key in object 'MEMB_INFO'. (severity 14) in C:\wamp\www\idreg.php on line 80

Warning: mssql_query() [function.mssql-query]: Query failed in C:\wamp\www\idreg.php on line 80