Are PC DVD games region free?

I am flying to the US tomorrow…I live in England…planning to buy a few PC DVD games while there…I wanted to know if PC DVD games are region free or locked since its PAL here and NTSC in the US…not talking about XBOX 360 or PS3.

PC games are region free.

Thanks!

yeah, i got call of duty united offensive in san fransico and it plays with no problems here in the uk

ONLY VideoDVDs can have region protection on it.