What the heck? 7 updated and everything is different

Hi, I've had my computer for about 6 months now, with 7 home premium on it for that time.
Just updated today, well I didn't, I was playing a game and it force restarted changes on me, and when it rebooted EVERYTHING was moved around. None of my files are in the same place, settings back to factory, it lost my internet data (history, bookmarks, auto-fill), every program that I start runs like it's been run the first time and it can find any save files for those games. I found some of my docos/pics etc. just a second ago. I was keeping them in libraries but it had transfered all of them over into computer-local disk- users- me
It changed all my settings and is making me 'ask for admin' permission or whatever. It also put IE and Games back on my desktop (I'm pretty sure I trashed Games! ) And a bunch of icons that were normally in my taskbar are either invisible or just gone. I attatched a photo of it so you can see what I mean.
It also deleted that sidebar thing with the weather/cpu info on the right side. It's seriously like it's back to factory setting or something!
It's INCREDIBLY annoying, I have moved all my docs/pics/music back but I want all the changes to go back to normal, like I don't know what settings to do, and why my programs are running like this. I have no idea what settings to change, no idea how to get my programs to run normally.

Oh and now my computer is running really loud. I don't know why. It's never this loud unless I'm running like itunes, a video game, and a bunch of other programs. I built it myself and it is awesome.

Ugh I just don't understand why an update did this. Did I do or not do something that caused this?? Does anyone know why this happened and what I could do to change it back?

@Dustsailor
Nope. I keep it pretty simple. The last two things I downloaded were WinRar and the EA Games Download.
For the deletion thing, I delete items like music/pics/docs I don't want but not anything major, I use add/remove for programs like a good girl. I got rid of games right after I installed the OS. Never had issues until now.

@TVblen.
Yeah I am considering it, after I save all the files that were obtained. I just don't want it to do it again after I restore it so I'm attempting to figure out the cause.

Oh and not directed at anyone- I have Norton 360 that catches any viruses and whatnot my way. It seems to do an extremely thorough job and I had a routine full scan/defragg/clean awhile before the issue.

@JaidynM- I'll do that when I can get it working properly for sure.


So I just did a System Restore.
It got my widgets back and restored some settings, but moved more of my documents to a completely different folder than
And then I tried to find my Sims 3 program folder and I found it in my writing folder. This is incrdibly confusing. I have no idea what is going on with this thing. I thought it said it wouldn't affect documents, but when I restarted, Word popped up to tell me that two documents I had created in the past day could not be found.

It was a Windows Security update.

But I'm thinking its a virus now. Norton is having some issues with updating subscriptions and the computer has restarted twice for no reason. No blue screen, just restart.

To cover the bases, you could run a full scan with free Malwarebytes.