This info comes from snapshots that you took upon reboot after a failure (the "instant shutdown" problem), correct?
If not, well, wait until it does fail and then do it all/post it all all over again.
If you DID post the info you got just after recovering from one of those failures, then this (http://prntscr.com/13m2n7) tells us that you have this (http://social.technet.microsoft.com/wiki/contents/articles/3192.event-id-351-windows-diagnostics-performance.aspx) "problem," and in your case, it is a problem with your USB device(s) and/or their drivers.
However: this is rarely - maybe even nigh on impossibly - the cause of a fatal problem. It is almost always nothing more than a small performance issue. (Especially since you HAVE installed the Win7 SP1, which has updated USB drivers....)
Unless you've been seeing/have gotten some USB errors popping up, I'd consider the preceding to be a red herring.
That leaves us right back where we were, I'm afraid. :'(
So let's try another path to find the problem, if you're up to it.
We are going to look at the System Event Log and look at what your system thought was going on in the recent past.
0) Start -> Control Panel -> Administrative Tools (You may need to enable Administrative Rights here?)
1) Double-click to select "Event Viewer," then expand the branch "Windows Logs," and select "System" from the drop-down list.
2) You should now see a pane labelled "System Number of events: <blah, blah, blah>"
3) Select "Filter Current Log..." from the right, topmost pane, and in the popup window match the settings here:
(http://i43.tinypic.com/m73zih.png)
You should now be able to see all values for all five columns displayed.
4) In order to display more events, "grab" the bottom of that pane and pull it down about half the distance to the bottom edge on its window.
It should be something like this:
(http://i39.tinypic.com/2a3fvs.png)
5) Click on any line in the "System" pane to display detailed information about that event in the bottom middle pane.
Since turnaround time between posts takes time, hopefully looking around at these event logs on your own will give you a clue to what's been going on inside your computer. If not, perhaps posting your version of the complete Event Viewer window might allow one of us here to see something that might lead the way to a solution.
Good luck!
ok just wanted to make sure. did a system scan with avast and found some viruses that i was unaware of and dealt with them this morning. so maybe that may of been it but not to sure. will see i guess. will keep looking for suspicious things and report back once the comp shuts down again.
Soooo, after you "took care of those viruses avast found" ... did you run the scan again?
Always RE-scan as many times as it takes
to have a scan come up completely clean.