Windows 7 - display driver problem

hello everyone, i just want to say im new here and want to congratulate u for the great page...=)

my situation is this... i bought this hp pavilion dv4 1435 more than a year and a half ago, and shortly after began playing online games... not demanding ones, just regular games... everything went fine until, about 7 months ago, while playing, the "display driver stopped and has recovered" problem began... this only happened while i was playing, i could watch movies or surf the web w/o any problem.

i contacted HP support, where we reinstalled drivers, updated them, i even returned the lap to its factory state, without success.... they told me it could be the chip itself, so i took it to a repair center, where they checked it, even to voltage and that kind of stuff, and no results...

now im desperate, so i went back to trying on my own in case its a driver problem... i downloaded driver manager programs, so i could update everything and check all the drivers, but today, as i was trying to remove the Mobile Intel 4 Series Express Chipset Family Graphics Driver, i noticed it doesnt seems to unistall... i tried to boot in safe mode, go to device manager, and unistall them (cause strangly, in the display drivers tab, there appears to be 2 of them)... but then when the lap restarted, windows update reinstall it... so i went to turn off that kind of reinstalling, tried to unistall it again via safe mode, but when i come back, it still looks as if i have the driver installed, eventhough device manager does not show it, and even typing dxdiag, in the display tab, doesnot show anything, just "n/a"...

so i was wondering why is this happening? why cant i unistall this completely... when i tried some months ago, i could install drivers from fresh, the lap was like in VGA or something, with large resolution or something... but now, eventhough i "unistall" the drivers, and that device manager and other stuff cant find it, it looks as if i have the driver... as if i never unistalled it... any help would be appreciated!