I upgraded my memory. Kingston 128MB PC133 CL168 Pin DIMM. This seemed appropriate for my Athlon Kinetiz 7E Apollo KT133A. Basically I had 256MB in Bank 0 and added 256 to Bank 1. It worked fine the first time but the next day refused to boot up Windows XT giving me the "the following file is missing or corrupt: ntfs.sys". Re-booting with XP disc as it suggests does not work: it just hangs at the error message and all keys simply restart. I removed the extra memory and it seems okay i.e. it boots up. Can anyone suggest why it doesn't work? A similar posting suggest an upgrade in power supply. Mine has a total power output of 300W. Thanks.