Chances have just been halved.
D/C the HDD from the CPU immediately. Install a HDD recovery software then connect back the HDD for recovery. Chances are, even if you manage to recover the content, it may be corrupted too.
U should be able to recover most of your data in this case.
But do you have an external HDD where you can save your recovered data to???
You can try 'Hiren's Boot CD'. Download it and burn the ISO image using your favorite burning application. You can google for the download link.
Place the boot cd in the cd drive and configure the boot order in bios to boot from CD ROM first.
The boot cd has some great utilities that run from the CD itself, including a few data recovery utilities. Booting from the CD, you will see a menu. Choose recovery tools. There are 2 of my TOP software recovery tools there. 1. Ontrack Easy Recovery and 2. Winternals disk commander.
Run Ontrack first, choose the recovery directory to point at the initialized HDD. You do NOT want to write/save anything on the HDDs that have data loss, as it will minimize your chance of 100% recovery.