Virus has messed up my pc please help :'(

AMD Athlon 64x 7850 Black Edition x2

ATI RADEON 4850 1gb video card

4 GB DRR3 ram

Windows 7 Ultimate

all put in a pretty neon lime green case

 

 

 

Ok so,

 

 

I have norton internet sec. 2010. 

I maunlly turned off the whole thing cause it was messing with a download.

Well it stayed off for a few hours.

I proceed to go too bed, and norton tells me it had an error. I think nothing of it, and turn the pc off.

I tried to cut it on today, and it boots with the windows screen, and brings up the login, I type in my password, and then everything goes black, all I can see is the mouse. "CRT-ALT-DELETE" does bring up tskmngr and things are running, I can even open programs with the programs-   exe.     

I tried to run a repair with windows on start up, but it says nothing is found. I put the Norton disk, in on boot up and I tried the repair on the different files I could. And i said 0 FOUND...........so I was like well WTF now, and here I' am. 

 

I have TONS of files on this pc that I need, downloaded games, ART, written stories, pictures. That have NEVER BEEN BACK UP.