Cannot run safe mode, cannot enable system restore

Hi all, I'm hoping you guys can help me out.
I recently had a problem with loading windows as everytime i tried loading it would stop load the wallpaper and do nothing else ie no icons, no taskbar, no access to task manager. I tried loading safe mode(all 3 types) and after loading the sys files it would restart and come back to the F8 screen. nothing seemed to work. So i installed windows again but in another folder as i was hoping to eventually come back to the original windows. i ran a virus scan in the new windows and removed all detected viruses however still couldnt revert to my old windows because the same problem prevailed. i finally gave up and started using my this new windows inspite of not being able to access several applications.
My new problem with the current windows is as follows: My system restore is disabled and if i try enabling it i receive a msg saying it has been disabled by admin ( I have just the one account for login ) Now i try restarting in safe mode and i get a blue screen error saying "Problem detected, windows shut down to prevent further damage. Tech details: STOP: 0x0000007B(0xF895828,0xC0000034,0X00000000,0x00000000) "
So there seems to be no way of enabling system restore.

If you could help me out with any of these problems including the case of my original windows, it would be very helpful.