Hi Blues Harp,
Took your latest advice and shut down progs in the task bar. To cut down job time I took them out in blocks, binary chop style, and soon came to the conclusion that none of these had any effect on settings saving time. I then unchecked Stopzilla in the services list, shut down, booted back up. On the second and all subsequent shut downs the settings saving took less than one second. All credit to you, you were right about Stopzilla's causing the shutdown delay!
I then installed the Microsoft Security Essentials you recommended and this does not affect shut down time at all. What about Superantispyware and Malwarebytes? Could I now remove them if I decide to continue with MSSEssentials? I have reservations about MWB anyway, because as it was scanning, Stopzilla blocked and reported an infection "GASF" - see
http://imageshack.us/photo/my-images...quickscan.jpg/
which passed MWB by, just as happened with AVG, which is why I continued with SZ before.
You can see why I feel safe with SZ. I need to weigh up whether to risk going with MSSEssentials (with or without MWB & SuperASWare?), or to continue with SZ and sacrifice the shut down delays, which I need to take up with SZ anyway.
I want to thank you for showing me the way to point out the culprit in the settings saving delay. Have you any comments on the above?
PS
I just discovered that MWB and SuperASW are only trial versions and MWB lasts only another 12 days. Presumably that means they're not free, and I've already paid a lifetime sub to SZ, which rather alters the considerations here.