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Hello Max.
Many things could be causing the problems you're having. Indeed, some of them, not relating to your hardrive at all!
It could be a quirk with the OS (as windows 7 is still being ironed out re:drivers), it could also be faulty hardware.
You say that you've run seatools, and that it hanged.
Was this seatools DOS? if not, you need to run Seatools DOS.
Running seatools from within your OS is far less stable than allowing it to run outside of windows.
To figure out whether or not your HDD actually has a prob - you need to do this. 
Hello Max.
