First Go to Windows 7 Control pannel.
Click on System and Security
Click on Remote Settings
This will pop up a new windows that will allow you to setup the remote desktop settings. Options are similer to other Windows Versions except for couple new options.
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Under Remote Desktop select the option
"Allow connection from computers running any versions of remote desktop (less secure)"
If you are trying to remotely connect to your Windows 7 computer using Windows XP or Vista computer this would be the best option even though it says less secure.