How to completely remove MSDE

I need to completly remove MSDE from my PC it was installed using Install Shield Express and when I try to uninstall, I get a Fatal error durring installation. There must be a way other than reformatting?

Thank you,If you can tell me what the error said, then I'll be in a position to help you. But If it said something about some file not be able to be deleted, make sure it (MSDE) isn't running.