You're looking at a brand new wallet, not your old one. Two possibilities: you didn't copy the old one into the correct directory, and/or you copied the wrong wallet entirely. Remember, each user account gets their own wallet, so if you logged into your virtual machine as a different user to the user who mined the coins (eg, Administrator when you weren't logged on as Administrator when you were mining), you'll be looking at an empty wallet. What operating system(s) are you using?
There was only one user and one wallet file. The hard drive was untouched. I did everything bitcoin related from that one computer. I've already scoured the hard drive to find any additional files, including file recovery software. The wallet file I have was created in june 2011 and last modified oct 2011 which is probably about when I stopped mining. A new wallet wouldn't have that.
Windows XP on the mining machine.
Windows 7 on my current main computer.