this is the thread that helped me repair my pc:
http://forums.techguy.org/windows-7/...t-start-2.html
so there are three options: restore your system to another date, restore your system to the factory level (when you first bought your computer) but with a backup option. and there's another option but i did not try it because my pc is in french and I wasn't sure if I could do it like the guy did since his pc is in english.
he made a video and shows how he copied the missing file to the C disk
before you get to the three options here is what you do:
1) restart your computer and click on F1 repeatedly (it might not work the first time, but restart it until you make it to the Windows Boot Manager screen.
2) Press F8 go to Advanced option. Highlighted Repair. press enter.
3)Next window is "System Recovery Options" (make your selection for Country) click next. Log on window key in your usual logon details.
4)Next window "Choose a recovery tool". you can either choose system recovery which did not work for me, pick the commands options like the guy who uploaded a youtube video or restore it to the factory level.
with the factory level option, i have to reinstall programs like microsoft office though...
I hope my explanation wasn't too horrible.