Here's a site with help for Skyrim problems on PCs. I can't guarantee these fixes will work but there are so many problems with Skyrim's implementation on Steam, I'm posting it.
http://crashfixes.com/fixing-skyrim-crashes-freezes-errors-steam-crash-no-sound-lags-choppy-framerates/
Skyrim has a lot of cache problems. However Betheseda writes to the Steam cache files often corrupts the cache files. Once the cache files are corrupted in Steam, it's a fragile system and a lot of problems occur. As long as you can rebuild the cache file, it'll be ok.
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