SIREFEF.* part of virus name

Hello:
Last night the MS SE on my home computer went red. Clicked on it to update and to become functional again, little panel came on can’t do. Clicked o help and it went to MS (it appeared to be from MS any way. It looked legitimate), “PC Utility Kit” that analyzed my system and said malware status was good and identified, among other things slowing down my computer, over 5 GB of files ( Not likely. On C drive I only have programs, no data files). When I found out that I have to put my CC#, with no internet protection, I backed out. I think this was the source of the virus.

Uninstalled my MS SE and reinstalled it. It went OK. Got update and all.
Then I got these popups on the windows explorer, not from internet, that “you are about to be logged off. windows have encountered a critical problem and will restart automatically. And it does restart automatically.

I have shut down the internet connection and disconnected all external hard drives from the computer. The only things connected to my computer now are the mouse, the key board and the speakers. No data storage devices.

I am in a loop. In the MS SE history there is this Trojan/ Win64/, Win32/, Virus., all ending with SIREFF. With different extensions. For example Trojan/SIREFF.A; Win64/Sireff.p; win32.sireff.aa., ETC., ETC. All of them are marked “removed” in the MS SE history. I counted them. Some time there are 3 of them, next time the computer restarts, there are 4, next time, there is 1, next time there are 31 of them. The number goes up and down each time the computer restarts itself. I don’t understand why they go down and then go up. However many there are, they are in the closed environment. Nothing comes from the internet. So if the MSSE has deleted some, why do more come up?

When the system restarts, the MSSE sometimes tells me there is a virus that needs to clean. So I click to clean. Sometime MSSE pops up that I need to restart the computer to finish cleaning computer. What always happens is that the windows explorer pop up comes on with “you are about to be logged off……” and it restarts the computer and the loop.

I tried to do a complete scan and even a quick scan, but the computer restarts before much scanning is done

I tried to do a system restore. But the system said the computer cannot be shut down to do a restore.

Is there any way out of this short of formatting the C drive and reinstalling all the programs again?

The computer is Win7 64bit running Windows Home Premium.

Sorry for the long post.

Thank you for any suggestions.
Webuser