Two Windows 7 desktops quit shutting down following updates

I have two Dell Windows 7 desktops which have been working normally until this week.
Although I cannot prove it after several updates earlier this week both of them started hanging during shutdown.
I was running Classic Shell so I removed it and thought that fixed it but no.
I have searched the web for a solution and believe it or not one was fixed by running sfc /runnow and seems to be ok
The other was not fixed.
A suggestion to change 3 settings in the registry was tried on the other one but I only had one of the three settings in my registry and did change that setting from 8000 to 1000 with no apparent effect
Last night after it hung for 2 hours and hard drive was running continuously I shut it down with the computer power switch.
But, when I tried it this morning, it just stopped and did nothing.
Chuck

I'm wondering if he can get to Safe Mode where he could run a system restore.

No I can there are no restore points

Yry to run sfc /scannow at least 3 more times, rebooting after each scan.

Are you saying that you can get to Safe Mode but there are no restore points in System Restore? That would be interesting because you said you installed updates this week and Windows creates a restore point before installing updates. It sounds like the updates weren't installed.

If you are able to get to Safe Mode, what happens if you try rebooting?

Is this system a laptop? Dell normally has a Factory Reset option I think you click on either F12 or F8 when booting. Of course, you will lose software you have installed and will need to reinstall it.

no i didn't make myself clear i cannot restore the computer. For what ever reason it fails.

Good you found the solution.

Please mark this thread as solved.

I like that serendipitous stuff.

Would never have thought that Norton would have anything to do with it but I'm glad your problem is resolved.