XRDP can be used to allow a remote desktop connection from a windows PC.Display Resolution
Install XRDP from the RPi command line
sudo apt-get install xrdp
Then to use it press the windows start button > All programs > Accessories > Remote desktop connection. Enter your IP address and then the standard RPi login when prompted and you'll get a full size grey screen followed by the GUI.
Switching between full screen and window mode in remote desktop
Use CTRL+ALT+Break to toggle