** This fix has stopped working for me after a shut down, currently integration features doesn't seem to be supported in Virtual PC :( **
![Unable to Enable Integration Settings - Windows 7 Virtual PC Unable to Enable Integration Settings - Windows 7 Virtual PC]()

Whilst upgrading my system to Windows 7, I noticed that the Integration Features wasn't working with my Virtual PC Images that hosted Windows Server 2008, The workaround is to restart the Virtual PC Integration Component Services Application.
Open up Command Prompt (type CMD in run), once in command prompt type the following.
net stop “Virtual PC Integration Components Services Application”
then
net start “Virtual PC Integration Components Services Application”
That should restart the service.
From the Virtual PC toolbar, you should be able to enable the setting now be able to make use of the features :)
Alternatively you can select the service from the services list and click restart.
Jonathan