Hi, I have a old IBM PS/1 486 SX and I am trying to set it up for my brother so he can type on it. It has a 400mb hdd and 8mb ram. With Floppy drive and (Non Bootable) CD-ROM Drive. When I start the computer up it says Non-System Disk or disk error Replace and press any key when ready. I need a soultution on how to fix this so I can type on it. Thanks