And it would help us help you if you'd read the red text that is shown every time before you post. It says to include details about your system.
so, i have a capacity of 686 gigs on my hard drive, it says i have 543 gigs used, 142 gigs free. but when i scour the system files i can only actually find 185 gigs or so, i cant seem to find the extra data.
Am i missing something

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic