Mouse freezes when connecting laptop to projector

Hello everybody,

I'm experiencing the following problem with my new Sony Vaio VPCSB3L9E/W, but I don't know the exact model projector because it is in a classroom, shield in a box on the roof.

Well, whenever i connect my laptop using the commonly known Win + P the mouse pointer freezes. The keyboard is active and using the arrows I can send signal through the VGA port. The same happens with Fn + F7 shortcut.

Has to do anything with the resolution ?
Is there any short-cut to re-enable the mouse if it is somehow disabled ?

Any suggestions ?

Thanks in advance.

I'm confused here, the laptop you mention came with windows 7, but you have your operating system listed as xp?

Thanks for clearing that up, helps to know exactly what we are working with*
I have two immediate guesses as to culprit.

1 - Over aggressive antivirus/firewall software blocking access to things for no real reason. (in which case snoozing the software before connecting would fix the issue)

2 - A driver conflict, which would be difficult to troubleshoot from a third person perspective as knowing which driver is specifically at fault would require more direct contact, and more than likely some troubleshooting procedures.

*note : not using windows 7 doesn't immediately mean you won't get support here it's a friendly bunch.