Hi. I was linked to this site from annoyance.com concerning an Invalid System Disk, etc. error message. The thread here was closed back in February I think. My situation is a little different. I have a Compaq that I'm using as a b/u since the mobo on my AMD 1800 got nuked in a storm we recently had. Everything was running ok - it's a 98SE with a 40 GB HD on the mobo and a 60GB HD on a Maxtor ATA card. I was uninstalling some proggies and didn't notice anything out of the ordinary, until I went to reboot. That's when I got the error message. Fortunately, I had just made a Drive Image b/u, and popped in the rescue disks and was back in about 1/2 hour. After some trial and error (and it happening again two more times) I finally boiled it down to one very unlikely program: Key Maestro. I could uninstall virtually everything but the OS, and had no problem when trying to reboot afterwards. But each time I uninstalled Key Maestro, the very next reboot generated that lovely error message. Eventually I intend to do a total reinstall with W2K instead of 98SE (as soon as I can get the right drivers for the Maxtor ATA card to be accepted by the W2K install; but that's another matter.) In the meantime, I wanted to toss my experience into the ring and see what folks here thought. It's obviously such an odd connection that I doubt if anyone here has heard of this happening before. I mean, I've heard of programs that didn't want to uninstall from a computer before; but never one that caused a dos/booting error message after a supposedly successful Windows program uninstall. I'm at a total loss in terms of even trying to understanding it; but thanks to Drive Image, I'm not a total loss of anything else. Man, I really love that program. I don't even want to say how many times it's saved me. TIA.