Lost os disk for dell 4600

Hello, I need help...I was installing internet security on my dell 4600 desktop and it asked me to remove 2 items before it could be installed. I proceeded to do this along with removing other things i thought weren't important. Something happend my computer rebooted itself and came back syaing "diskette drive 0 seek failure and than when i hit any key it goes to the screenh saying \windows\system32\config\system
You can attempt to repair this file by starting windows setup using the original setup cd-rom.
select 'r' at the first screen to start repair. I don't have my os disk. I believe it came with a pack of 5 nor do I have my windows xp home edition disk. If I need all of these to repair my computer, how do find them?