[Help] SQL Problems -.-

Hey again, guys.

I used to have MSSQL 2000 here and my server was ok. It worked for some time and bla bla bla and then MAIET said they would sue us and we closed the server. Alright.
Then, after some time, my MSSQL stopped connecting (Stop symbol at the task bar) but I didn't care, because I wasn't going to turn my server on again, would I?


After some time (again) I decided to turn it on again, I felt really inspired by the new stuff people posted here and things people were finding out. So I uninstalled my MSSQL 2000 and installed MSSQL 2005.
I could connect normally to it with the Management Studio, but I can't connect to it with the Matchserver nor the "Microsoft ODBC Administrator".

It says "Unexistant SQL or Access Denied."


Can anyone help me with that problem?
I really want to turn it on again and I have no idea of what's causing this problem.
If any of you guys had the same problem and came up with a solution, help me :/

Thanks anyways.
Cya