problem with IIS..

Hello all, I have recently installed php4.2.1 with IIS 5 and 2000 SP2 and I'm having some wierd problems. PHP "IS" running but it is not running correctly. It doesnt seem to be posting and/or getting any info from forms/pages and the request variables. If I have a page like index.php it works fine, but if I try to do something like index.php?Topic=blah I getNotice: Undefined variable: Topic in c:\inetpub\wwwroot\phpboard\MessageBoard.php on line 3 I know the code works as I have the exact same page running on another server across the building but cant figure out why it wont work here. Aslo along the same lines I cant get PHPMyAdmin to work correctly either. The first page displays fine and shows everything it should, but when ever i go to actually do anything I get a 404 error page can not be found thanks for all your hep! -Nick