When I switch on my thermal goggles, my game crashes. What can I do? I am running on an Intel GMA graphics card, if that helps any.

Your graphics chip will do that. It is not a video card with its own memory so it shares memory with the system. The thermal goggles seeem to require more memory which overloads your system causing it to kick you out.

So the only thing I can do is get a differentgraphics card?

Yes. If it is a laptop (you do not say) it can be difficult to upgrade to a video card. On a PC it is not really that hard. If it is less than a couple of years old you probably need a PCI Express video card. If you like to play games I would suggest getting the best one you can afford for maximum compatability.