One of the things that requires admin.
Plus, i would lose quite a bit of work lol.
What you do is you back it up to a external USB drive and then restore. You don't need admin.
1)Turn off the computer (if its on)
2)Turn it on, and wait for the black screen with the flashing "_"
3)Press and hold F11 with your life. If it don't work, go through 1 - 3 again.
4)You get to the Restore Page.
5)Select a date in the list.
6)???
7)Profit.
Edit: This
WORKS! I've done it before.