Not so easy for me because got loads of data in database and Xoops system was all installed. If I just re-install I'll lose it all! But in your case, yes, you could try that. I think you'd be better running winmysqladmin, and when it first opens it will ask you for a username and password.
Fill that out and you should have privalges. That's what I did last time I had trouble, but now I'm locked out again! Dam