|Downloading an ISO of WinXP is not the best way to proceed. Your restore disks have all the files that came on the laptop. You just need to slipstream SP3 into those files.|
Before you do that you may be able to repair things. I am not sure what program you used that would result in different versions of some files being installed. That said running chkdsk may clear up the problem. Go to the third link below to learn about chkdsk.
In the future I recommend you only apply one clceaner program at a time with a reboot in between. I don't recommend registry cleaners, although the one bundled with Ccleaner is safe to use. Also, when using Ccleaner there is an option to save a copy of the changes. If you do that and save to desktop it is easy to revert back if needed.
I suggest you slipstream SP3 yourself. It is easy to do. Download nliteos and SP3 from the links below.
You will need to use a computer with a fast connection for SP3 and it also needs a third party CD burning program like Nero burning rom, Roxio easy CD creator, or one of the lesser known free ones.