HDD is bad

Put this hdd in another pc as a slave and try to recover your data

The chances are EXCELLENT that you've wrecked this drive.  Undoubtedly there is now physical damage caused by the impact after falling off the table.  If you really need to retrieve your data, DO NOT ATTEMPT to use any recovery software or even power the drive up.  You can very well make this worse.  If the head-assembly or other component in the enclosure that may contact the drive platter surface does contact the data recording surface you will literally scrape your data away.

GET PROFESSIONAL ASSISTANCE to recover your data.  There are many such providers.  Here in the USA, OnTrack is a leading recovery specialist.  Contact them for advice and a quote.

If you would really "LIKE" to have this data back but it's not important enough to pay for, then please try some of the recovery software.  In this case you don't have anything to loose.

here a good and cheap data recovery company :

http://www.gillware.com/      

if you want to try to recover with a software, do as said above : attach your disk to a working PC, and try any of these : (you can try the free trials, if they see your data, you pay for the full version)

http://www.grc.com/spinrite.htm                              Spinrite
http://www.runtime.org/                                    GetDataBack
http://www.stellarinfo.com/                                    Stellar
http://www.bitmart.net/                                    Restorer 2000
http://www.snapfiles.com/get/restoration.html                        Restoration
http://www.snapfiles.com/get/activeundelete.html                  Active undelete
http://www.pcinspector.de/file_recovery/UK/welcome.htm                  pc Inspector
http://www.handyrecovery.com/download.shtml                        Handy Recovery
http://www.snapfiles.com/get/smartrecovery.html                  flash recovery
http://www.ontrack.com/                                    ontrack
http://www.ontrack.com/easyrecoveryprofessional/                  Easy Recovery
http://www.cgsecurity.org                                    Test Disk + utils
http://www.z-a-recovery.com/setup.exe                        zero assumption
http://www.stompsoft.com/recoverlostdata.html                        Recover Lost Data
http://www.recovermyfiles.com/                              RecoverMyFiles
http://techrepublic.com.com/5100-1035_11-1051391.html#            Disk Commander
http://us.mcafee.com/root/package.asp?pkgid=105                  EasyRecovery

Something to try...
Use a boot cd to see if the data is available on the drive, if so...transfer it to a new hard drive (or burn cd/dvd media).
Knoppix: Live linux cd (will work on any system) http://www.msi.com.tw/program/support/download/dld/spt_dld_detail.php?UID=613&kind=1
BartPe: Live Windows CD http://www.nu2.nu/pebuilder/

thanks jhance so much.That's really good advice for me. As you know, no software or programe recognize the HDD so that i couldn't recovery data with any software.
My country is poor it's very difficult to fint the Company where can recovery the data
BartPe: Live Windows CD http://www.nu2.nu/pebuilder/ -> Not recognire my hdd :(

How could i set hdd platter surface?
any idea?

PS: I put this hdd in another pc as a slave but it's not successful(detected with a warning: Command Failed - i said)

>>   it's very difficult to fint the Company where can recovery the data << just send the drive to the company - you do not need to be in the same country

megaDittos jhance