go to start > run

cmd
then type:
chkdsk x: /f (where x is the drive's letter)

Allow a few minutes to a few hours of processing.
DO NOT TOUCH the USB cable during the process!

And don't forget to get back to us.
ill chek this out, but before i do, do you recommend to.do it on.visra.ir windows 7?
I guess you have to prioritize here,unfortunately.

would you rather have a headache and keeping your data (that is assuming,this is fixable)

or format the drive and have it functioning again.

if none work,it must be that it took a really nasty fall.
@ julien, thats what i got:
access denied as you do not have sufficient priveleges.
You have to invoke this utility running in elevated mode.

what should i do now?
U should be logged on as an administrator.

Go to Start, then type cmd (directly, without entering Run)
right-click cmd and click Run as Administrator.

You need to have an administrator account's password to make it work.
the type of the the file system is RAW.
CHKDSK is not available for RAW drived.

please tell me it is a good thing.
Oufff, too bad. Sometimes it catches the file system. You need more professional help here.
do you mean it is beyond repair now?
oh ok, tommorow ill be sending to a computer shop and ill tell you what will happen.
thanks alot julien and everyone else for your help :)
Devil'sAdvocate wroteI guess you have to prioritize here,unfortunately.

would you rather have a headache and keeping your data (that is assuming,this is fixable)

or format the drive and have it functioning again.

if none work,it must be that it took a really nasty fall.
After you do a format and take care not to place any data on the drive after that, then you would be able to recover every single healthy non damaged file that was present on that drive before format.

@metalloy: what exactly were you able to see in disk management? Was there a partition of any type? Unallocated space? if you are unable to describe, may you please provide us with a screenshot? (an efficient one, no bonuses, a rectangular snip using snipping tool would be efficient)

Edit: Ahh sorry, was on phone, didn't see page 2.

Edit 2:word of advice, metalloy, DO NOT send it to a repair shop.this drive, if working, could easily be formatted and made to work properly. If the guy there decides to run a test by copying a file to the disk , you could kiss some of your data goodbye. As devilsadvocate said, download ZAR, and try it. If zar needed it, then perform a format. This is done in disk management. Right click on RAW partition, then click on format (quick if you want, if ZAR would slow down too frequently when attempting scan for lost files, then do a full format and try again.) Format will not delete anything. Neither quick format nor full format delete anything. The only thing that deletes data is an unerase software that OVERWRITES the existing data on the drive with garbage data, which is not what format would do.
well thanks yasamoka,i actually didnt know you could do that without backing up.
ive download it zar and run it and it was going fine then a window showed up saying the following: an error has occured and it is not possible to continue execution the program will terminate now. The error message was Thread fault ident Thread

do you still recommend not going to a repair shop?
WAIT, try opening the enclosure, re-seating the hdd again. if it doesn't work, try plugging it as an internal disk
Plug it in a Mac computer, go to disk utilities and look for the drive on the left side. Click on the partition or drive name then click the verify button and wait for the verification process to complete. If your disk has some problems in the partition (which I guess there are), the repair button will become available. Hit that repair button; Mac will try to repair the disk, if there is a hardware problem with the disk, Mac will tell you that (meaning you're screwed).

No data will be tampered with during the process.

I also use another method to repair drives; Spinrite 6 is a low level utility that can do the job. If you can leave a computer running for 12 hours straight without any downtime, let me know.
my brother sent the hdd to the repairshop 2 hours ago, so ill have to wait and see, and if the repair shop is closed or something ill try your way mr. class
thanks for the help :D
try a different port or shaking it a bit (while unplugged)
you can also try manually connecting the hdd as a internal hdd with regular sata-power setup
other than that, like the others said, check for errors (not the windows version) the one that scans before it boots into windows, the freezer trick is useless, you have to freeze it for hours just to get a 2-3 minutes of time, so you can't remover much,if you want try getting some dry ice and using that while connected to pc

edit:if its not ticking then freezer option is even more useless, next time always have a backup of your files