I'm playing a computer game and then the game goes crazy?

I'm playing a computer game and then the starts to be so… Lagy and sundely the textures goes weird, everything using the wrong texture, ect
my pc
MS Windows xp Profesional SP3
INTEL Pentium Dual CPU E2200 @ 2.20GHz, 2,0 or 1,5 Gb of ram [i'm not sure], NVIDIA GeForce GT 430
my motherboard after 15 minutes its so hot
this hapends me in
half life 2, left 4 dead 2, prototype 2, skyrim, batman arkaham origins, unreal tournument 3, gta 4 and portal 2
but whit half life 1, warcraft 3, minecraft, terraria and diablo 2 this doesn't hapends
oh the games mentioned are everygame which i bought. It isn't a virus i have a great anti virus and i scan whit full scan
can anyone help me? Please

Added (1). EDIT my computer run those games perfectly execpt batman and thiss errors

Added (2). Edit maybe could be the ram if it is in 1,5 gb ram the most games requies 2 gb ram

Added (3). AND I WILL NOT CHANGE TO WIN 7 AND LOOSE All MY FILES

Maximo

It could be overheating of the processor or graphics card
check if your heatsink fan is clean and good condition

Steve

" this doesn't hapends
oh the games mentioned are everygame which i bought."
I didn't understand that part o_O

It could be that there's a lot of dust on the fans. Use compressed air to clean them.
and your PC is too bad to run most of the games mentioned.

Could hardware failure.

Mohamed

Your laptop/pc is just outdated. Sorry to say, but seems like you have to get a new one if you want to play those games.

Alan

Changing to Windows 7 won't cause you to lose your files. They are treated separately. And, you should back them up to another medium anyway for safe keeping. Stay away from Windows 8 though. It is unkind to older games.

Overheating seems to be the problem since it take a while to happen.
Check with a TECH to see if you can improve your cooling fan/ventilation. Taking the panel off doesn't help with air circulation.

Mikel