From a post here, I learned of some other things to try including DSS and GMER. I have the logs from DSS but could not get GMER to complete. It caused several apparently random BSODs, even in safe mode. When I finally got it to apparently complete a scan, I was able to hit save but then the system essentially froze at the Save dialog and I was not able to save anything, end the program, or even shut down cleanly.
I have not tried combo-fix yet. I've used that before but believe it is not something that should be run unless absolutely warranted. I do not know if it is.
Key symptoms are these:
- Random restarts after a day or two, perhaps after a BSOD which I do not see; nothing obvious in Event Viewer
- Lousy bandwidth on a wireless connection that should be capable of 10MBps downloads (getting <1 according to speedtest.net)
- Occasional complete loss of Internet connectivity necessitating a reboot; pinging the router was OK and other machines on the network had no problems.
Many thanks in advance for all help.