Can’t Load any Operating System

My son deleted a bunch of “stuff” from his hard drive and now when I try to reload any OS,I can load up to the point I need a CD. At that point I’m kicked out because the OS can’t read from the E: drive. Even when using NT Workstation I get thru disk 3 but when I put the CD in I get kicked out. I’ve used FDisk, reformated the c: drive and attempted to load Win 3.11, Win 98, Win 98 SE and Win NT Workstation. Any suggestions?