By the way… looking at your hijackthis log files, it looks like you have (or had at one time) other anti-virus programs installed (i.e. Trend Micro, Panda etc). Did you make sure to uninstall those? You should only use 1 anti-virus program at a time… otherwise you can run into problems.
Those are their on-line scanning programs. They shouldn’t be active or interfering as long as I don’t run them. If you think they are the source of the problem I can remove them, but do you really think they are causing problems?
The condition of my computer seems to be deteriorating as to the frequency of freezing or rebooting. Today I had great difficulty booting up altogether. I also have mail undeliverable messages to an address that there is no way I would have sent something to.
Is it possible that the freezing occurs specifically in sites concerning computer security?
I also had difficulty generating the HJT log since the HJT seems to freeze after the scan but before letting me save the log.
I can not say for sure but it seems you may have a “bot program” infection (undeliverable messages you did not send) that is stealing your system resources … or else, for some other reason, you are losing system resources to something that shouldn’t be. This could be the reason your computer is “freezing” and/or rebooting as these bot programs tend to max-out a computer’s resources. >:(
Also, too much heat can also cause these things to happen. Check your cpu & system fans. Try running the computer with the side cover off to see if this improves the freezing/rebooting problem. Set a portable desktop fan blowing into the open case to see if this helps.
Sorry if these things have been suggested before but I did not read the first page of posts about this. 
Thanks.
The heating point hasn’t been suggested yet and I will give it a try.
However I suspect the problem is with a bot program or other malware. I have scanned with nearly everything readily available and have not yet found anything.
The only thing is a CA online scan found a browser hijacker peopleonpage.apropos in a zonemap\domains key in the registry, but the behavior is not hijacker behavior. I also found that the zonemap keys are full of ad related sites which I presume are sites that are being blocked from entering the computer by ie-spyads or spyware blaster etc.
CA also found netzip, fresh devices, and network1.popups in zonemap\domains, but I am not seeing behavior that I would relate to these sites.
In the meantime, the computer is close to becoming unusable with freeze or reboot every few minutes.
I think your assumption is right. These keys are there by ie-spyads and spyware blaster 