No partitioning software, they are brand new hard disks. Ram is 2 128MB SD100's processor is a PII 450. This is a kit build and yes it was working at one time.. One thought: is there any possibility that there could be partitioning software on the hard disk? Another thought. I got this from the Windows 98 readme file, which happens to be posted at http://cns.tstc.edu/w3/3020/readme.htm It states that SU99xx errors can be sometimes be caused by low conventional memory. Also, I don't believe you told us: how much RAM do you have? Processor speed? Was the PC in question working okay before? Susan Sutherland Visit our website regularly for FAQs, articles, how-to's, tech tips and much more http://nospin.com - http://nospin.org