Oracle 9i eating up storage

i am using winxp sp3. i had installed oracle 9i server.

it was installed succesfully before it takes only 2.8gb space.

But now it is occuping all left space in c drive.

as 15gb was free in c drive , now it takes 16gb space and when i uninstall any software the space made by uninstalling it also moved into oracle folder.

plz reply ?????????