Before we make any specific recommendations will you please post a snip/screen-shot of the entire disk management drive map with a full description as to which drive/partition is which, so we can see what you have going on as there may be a fairly simple way to resolve the situation.
In the Windows start menu right click computer and click manage, in the left pane of the "Computer Management" window that opens click disk management and post a snip of that.
Samsung 830 120GB SSD
Intel 320 120GB SSD
Western Digital Caviar Black WD7501AALS 750GB 7200 RPM SATA 3.0Gb/s
Western Digital Caviar Black WD6401AALS 640GB 7200 RPM SATA 3.0Gb/s
PSU
COOLER MASTER Silent Pro RS850-AMBAJ3-US 850W Modular