Skyrim keeps crashing? Run as administrator?

Skyrim was crashing when I had a few mods I got so annoyed at it I just uninstalled them all and now uninstalled NMM. I just couldn't be bothered going back and playing skyrim until I bought the 3 DLC's I'm back to playing Skyirm and I'm enjoying it so much it wasn't crashing or anything then after a while it started again crashing once every time I played now I can't even play it loads my save and crashes. Right before the game loads the launcher gets an error and windows tries to close it and skyrim launches then crashes. I saw a "fix" (I don't know if it would work yet as I haven't tried) he said to run it as administrator. The only problem is I can't find that option it's not where it should be, it's in the right place for google chrome but not for any steam game. Only steam games it works for Battlefield and minecraft. So how can I run it as administrator if the option isn't there?

My PC can run it fine it's a self built PC.
AMD FX-6300 processor
Radeon R9 270x OC 2GB GPU
and 12GB(8 usable) of RAM.

It is automatically set to Ultra quality I have even tried changing it to High. I have all of the DLC's including the ultra texture pack one. The order in my data files is:

HighResTexturePack01.esp
HighResTexturePack02.esp
HighResTexturePack03.esp
Dawnguard.esm
Dragonborn.esm
HearthFires.esm

Fixed: Do a proper save when it loads then it should work.