SQL Problem

Hello EPvP

I hope anyone can help me, i try to atttach ep5
masterlog, master, model, modellog, msdbdata, msdblog, tempdb,templog.

But i cant rename, or delete the old ep4 files
(masterlog, master, model, modellog, msdbdata, msdblog, tempdb,templog)

what can i do? :(

You are not supposed to "delete" the old ones though, all you do is stop your services on your SQL and deattach the old databases.