Well forget but then how am i supposed to reinstall when i cant even loving get to my desktop
Use another computer, make reinstall disk, use bios on your PC to boot from CD, reinstall windows, enter your newly bought key (unless you have one), have fun.
If you can't do this then try to somehow revert the changes (it should have given you an option to undo restore.) Otherwise your stuff out of luck unless someone else has an idea.