Computer Backup Help


In Runtime
I am working or attempting to work on my sisters computer. It goes sooooo slow and her files are literally everywhere in every folder. When i try to move large groups of files to other folders it says it cant do it. I will try to send the files into a compressed zip and put them on an external source but i dont like the error i will try it to see what happens, hopefully it goes well. and does anyone have an xp cd? its kind of a dumb question put i need to wipe her drive or sumthing. there isnt a restore pt. on the system resore, so yea. also, does anyone have any ideas to get my sisters comp. to a clean slate without a windows cd? thanks alot

anybody have any programs to find duplicate files and get rid of them?