I had my boot order initially set to boot from the hard drive first, as best as I can recall; but to boot from my bootable OS CD or my recovery CD for my imaging software, I had to reset the boot order to allow booting from the CD before booting from the hard drive. In any event, I think the Microsoft Windows XP updates over the last several weeks were responsible for creating a conflict between the microsoft's update software and resident software on my system. I guess it is possible that I have some form of malware, but I just did an entirely clean rebuild of my desk top system, and every scanning tool I test it with comes back clean ... Panda, Kaspersky, BitDefender, Symantec, Security Task Manager, and IceSword. I then applied the most recent updates, and initially ~79 - 81 were applied without any apparent problem. Then , when I allowed the next 13 to download and install (most were Microsoft Word 2003 "critical " updates), the system became unstable (when I double clicked my WIndow Washer shortcut on my desktop to start up Window Washer, the Window Washer window would open up and skip across my desktop, and when I tried to get Window Washer to "Wash My Computer", the program would start then promptly crash). Norton Win Doctor noted mutiple registry errors after thiese last updates, which I allowed Win DOctor to automatically fix. The system then became less erratic, but now still intermittently will not boot. I spoke to a friend who had been in touch with his brother in law, who is much moe knowledgeable about computers than I am, and he says that he occasionally has trouble with the Microsoft updates causing his computer to become unstable, and he typically sets recovery points before donloading and installing them. I am not sure what to think at this point. Any thoughts? Thanks