You should've created the recovery disc(s) when the PC was new. But since you apparently didn't, there are two options that come to mind. First you can create a recovery disc on any PC with the same version of Windows as you have. Just go to Control Panel -> Backup and Restore-> Create system repair disc. Insert a blank CD-R and in about 3 minutes you'll have it. The other way would be to contact Dell. But you say you have a Pentium 3? Maybe you meant an I3? Pentium 3s went out many years ago; I seriously doubt if you could run any modern version of Windows on that.