CPU getting really hot.....

ok so i can play games like bioshock, lost planet and oblivion with max settings with no problems at all with my cpu idling at about 45 degrees celsius. but the call of duty 4 and unreal tournament 3 demos have both made my cpu get real hot fast. after playing for a couple of min my cpu will go towards 60 degrees celsius and once even crashed my pc and im using optimal settings for these games. should i be worried and deal with this or maybe its jus because its a demo??? i have a amd x2 6000+ with stock heat sink and fan with a radeon x1950 pro and 2gb of ram running on xp pro and 630 watt psu. If i should deal with this wat would be the easiest and cheapest way of cooling down my cpu?

Different games put different amounts of stress on the CPU, which is why some will overheat it, others wont.

You really need to increase the airflow in your case, or change the heatsink. I doubt there is very good cooling in an maTX case, I reckon your best option would be to get a decent size ATX case with improved cooling.

i dont want to get an atx case because im trying to save as much room as possible in my room.djseuung

Then buy a better heatsink. Small cases greatly restrict your cooling options... theres nothing much you can do about it.