Once at the activation screen:
start XFORCE Keygen 32bits version or 64bits version
8.Click on Mem Patch (you should see successfully patched)
9.Copy the request code into the keygen and press generate
10.Now copy the activation code back to the activation screen and click Next
You have a fully registered autodesk product
NB: Make sure you are running the Keygen as administrator and with UAC off on Windows7
And use the keygen for the right Product