How to recover data from formatted hard drive?

  slktec 08:10 03 Mar 10
Locked

I got a two hard drives in my PC.(160GB & 500GB)
Windows is running on 160GB HDD.I try to install Linux to 500GB HDD.At first, Linux asked to change HDD file format (NTFS to Linux format).I click on first option and it's done.then I stop installing Linux & went to MyComputer. The computer doesn't show the 500GB HDD now. When I go to the disk management, It shows 500GB HDD & indicate, It's totally has free space.
So I want to know how to recover my data on 500GB HDD.I think It's formatted.

Please help here. I gotta necessary files on that 500GB HDD.

  GANDALF <|:-)> 08:21 03 Mar 10

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G

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