When I did the clean reinstalls I formatted the partitions so that should have helped. I backed up my data to an external hard drive(WD Passport Ultra)I restored from that so I might have been reinstalling the problem, but I did not restore the system image that was in the backup. I also ran a repair install several times but that didn't work either. I have been working on this for a couple of months & went to several different forums to get help so did a lot of different fixes that didn't work for me. I believe that uninstalling the AVG was the fix I needed.
A lot of the people that responded to my dilemma thought that the problem was a corrupted update from MS. That's what I thought too. Probably it was an update that was conflicting with the AVG & not the update itself. The one that seemed to set it off was a cumulative security update, but I don't remember which one it was. I had left the auto update on. After that I turned auto update off, started all over, & checked each one before downloading it & reinstalled them one at a time with restarting after every update so that's the one I think was conflicting with the AVG.
One person on this forum asked me if I made the wind 7 disc myself, which upset me because of course I didn't. Then he gave me several fixes that were, according to him, easy fixes & of course I had already tried them all & they didn't work for me. He insisted that the issue was a bad DVD installation disc even though I had pointed out that the disc worked perfectly for several years. The only reason that I haven't updated this machine to a newer version of windows is I have several programs on it that won't run on higher versions.
I am going to run another sfc scan because I did see a file that was unable to be repaired. I uploaded it to this site a couple of weeks ago but no one commented on it. I haven't run a scan since then so will do it again now.
The Tune-up did not seem to disable any of the files that you mentioned although an update did remove my weather gadget & a different update removed my clock gadget. I went to MS support they said that the gadgets are a security risk & that MS deleted them. I am going to start another scan & will get back to you with the results. Thx for taking time to help.
