Thanks again.
Step 4 did not work. I noticed the following:
***********************************************************
C:\WINDOWS\system32>%systemroot%\SoftwareDistribution\DataStore
'C:\WINDOWS\SoftwareDistribution\DataStore' is not recognized as an internal or external command,
operable program or batch file.
C:\WINDOWS\system32>%systemroot%\SoftwareDistribution\Download
'C:\WINDOWS\SoftwareDistribution\Download' is not recognized as an internal or external command,
operable program or batch file.
C:\WINDOWS\system32>%systemroot%\system32\catroot2
'C:\WINDOWS\system32\catroot2' is not recognized as an internal or external command,
operable program or batch file.
************************************************************************
Would this have been right?
Anyway-----
I just found the "installed updates" section in the Control Panel, and it shows that a Windows Update was installed on 11/10, and Security Updates were installed on 11/12 and 11/13, so I presume that the problem is in fact fairly recent.
Any chance it might fix itself? How long should I maybe wait before I'm at a security risk?