If u delete the way suggested by all these guys will ofcourse do, but if u have WIN as OS then the registry contents will be left with & u cant do anything but to delete manually if u know have knowledge of contests in registry .

If u delete manully all the said files and say u want to create a new DB with that DB name u were using, OS will not allow u to do so as u r left with registry contents.....

S if u use ORDIM then it will delete service & contents in registry as well.

Regrds
abhay.