i played with partition magic and did these things: i created i: logical drive. i make it primary partition. and have two primary. i forced to boot from this i: so it didn't boot. now it seems that c: becomes f: and it seems that inactive but i can view f: and its folders and files. I don't have diskette driver on my pc. so i don't have boot diskettes I think it is a simple reactivate primary partition command. I consider to install a new xp installation on c: (old f: ) and run partition magic to change f: to c:.