Hi there,
you can change the region on a laptop DVD drive 4 or 5 times, after which it is locked to one region (not sure about windows 7)
Go to My Computer
Right click on the DVD drive & click 'Properties'.
Click the 'Hardware' Tab.
Double click on the DVD drive
Click on the 'DVD Region' tab
Change the region as required.
Remember that offcialy you can only do this a set number of times, after which you can't make anymore changes. Though if you were to hunt around you could probably find some means of unlocking the drive to enable unlimited changes or seting it to all regions....