Thanks for the replys.
A little history: This is a relatively new PC, maybe 4 mos, and it's been working great, except for this glitch, which I've been working on for about a week now. In the proccess of investigating, I found some minor spyware. In trying to fix that, I tweaked the REG, and ended up having to re-install Windows 7

.
I was happy to see that System Restore seemed to work after that. I could create a restore point and it would show up in SR.
But then a short time later, perhaps after all of the updates - or maybe just a simple re-boot - the restore points disappeared.
Then I tried all of the other measures listed above, to no avail.
I would LOVE to have my entire system working properly, but I've already spent WAAAAY too much time on this issue.