Do what I recently did
Create a new steam library on another partition in a folder called Steam2. Set it up via steam:
http://www.neowin.net/forum/topic/11241 ... available/I run a SSD for my main than I have two standard drives. I put new, more "intense games" on the SSD while older games and less "intense" games (Civ V etc.) on my standard drive or library two.
You'll have to delete and redownload the games in the new directory (unless you can research a better way to transfer them to different librarys).
This will spread out your load amongst your drives/partitions.
As for your errors and shit...google nigga