If I understand you correctly, you are trying to remote in onto a Windows 7 Machine so that you can run your SSH software, is that correct?
The first thing is to check your RDP settings on the Windows 7 Machine - Right Click Computer and click properties. On the left hand side click Advanced System Settings. Click the remote tab and select the option for "Allow connections from computers running any version of remote desktop (less secure)"
Try the RDP again.