My Western Digital 500GB HD is not cooperating

Hello there,
I was wondering if anyone knew how to help me.

I have some pretty important information on my hard drive I bought last year and in the process of cleaning it out I accidentally deleted some hidden files that I imagine were not suppose to be deleted...

My computer will now not even recognize it as a valid drive. It will not show up in My Computer, Devise Management, Computer Management/Disc Management nor the Western digital freeware that I downloaded (Data Lifeguard Tools, WinDLG). It is not recognized in Acronis Disc Editor, nor Active@ Partition Recovery Enterprise.

I have also tried retrieving the deleted hidden folder with the program PC Inspector File Recovery, and DiscInternals Uneraser... with no luck.

The drive still acts like it is fine for I can hear it spinning and when I boot it is partially there.
When scanning hard drives it says: IDE Channel2 Slave - S_ATA2 -

part of the information is missing because my other drive that is fine says:
IDE Channel2 Master - S_ATA1 - WDC WD800JD-0

When I enter BIOS the same message

Channel2 Master [S_ATA1 - WDC WD800JD-0]
Channel2 Slave [S_ATA2]

Can anyone help me with this disastrous predicament? I am in dire need of a genius computer technician!!!!

The Make is Western Digital WD5000AAKS
a WD Caviar SE16
MDL : WD5000AAKS - 65TMA0
Date : 27 April 2007
DCM : HANCHV2CAB

Welcome to Windrivers Sethward

Well it looks like you tried the obvious... did you start the data lifeguard tools from within windows or did you boot from the CD? If you tried only from windows then you should boot the datalifeguard cd. On top of that there is couple of things I would try

1. See if you have more than 2 SATA ports, if you have, plug the drive into the 3rd or 4th port
2. Remove the drive and get a USB to SATA connector and try and get to recognise as a usb drive.

There might be a problem with the sata cable or the sata controller you are using.