Windows 7 - Service Pack failure hence reset to previous version

Ok, let’s see if I can make sense out of this, maybe you can too…

My system tells me that an update is ready for installation. It turns out to be Service Pack1 KB976932. It loads and installs. On reset, the system stalls on “Starting Windows” with that fuzzy MS colors icon on the screen. 10 minutes later I press Alt,CTRL,DEL… nothing happens. I press NumLock, no light change, so I do a hard reboot.

““Launch Start Up Repair” is reported. Then “Unable to Start, Searching for problems” as the progress bar indicator sweeps across. It times out and asks “Do you want to Restore”, I hit OK and the progress bar indicator sweeps across again. This goes on for about 15 minutes.

“Cannot Repair Automatically” and when I hit OK, the system turns off.

On redstart, it boots fully and is probably in the same arrangement as before this whole session. This is the third time I have run through this process.

Thoughts?

Apparently other updates have been successful as the log indicated as such.

Have you a recent Back Up, prior to these problems, on an external Hard Drive?

FYI.
Clean Install Windows 7

Repair Install

According to my log, it has been going on for almost a year. I was just not aware that it was not loading until recently. I am not the only one working this computer. I will check into the URLs you suggest.
Thanks