For Windows 7 32-bit systems, if you configure 2GB of memory, there is no problem. If you configure 4GB of memory, the mouse and keyboard in VNC will fail.
For Windows XP 32-bit systems, if you configure 2GB of memory, there is no problem. If you configure 4GB of memory, a blue screen will be displayed.
Windows 7 screenshots
Windows xp screenshots
For Windows XP 32-bit systems, if you configure 2GB of memory, there is no problem. If you configure 4GB of memory, a blue screen will be displayed.
Windows 7 screenshots
Windows xp screenshots