powerpoint spell checker

i have office 2000 installed but did not have the powerpoint installed..went back and just added powerpoint....it works fine with the exception my spell checker will not work..my spell checker works fine in word and excel...but in powerpoint it justsays spell check complted...so it works but it don,t even tell me i have a mis-spelled word when i know i do..if someone emails me a ppt file it will work on theirs, but not on mine that i create...why is this and can i fix this???
thanks
steve