what game are you having problems with? i gather by the info above you have xp?
most browser games use java click here to get the latest version.
by the looks of it you have service pack1 installed but click here anyway and install any updates listed.
update your graphics card drivers click here or click here maybe and update them. update your sound card drivers from the manufacturers websites to the latest dx9 versions and your motherboard chipset drivers too.
click: start/control panel/system/advanced/start up and recovery/settings and untick 'automatically restart' you should get get a more useful error displayed next time it crashes. post it here or look it up in the search(KB) box click here
if its a cdrom game and not web based insure you have it patched to the latest version and if its a recent game install direct x9 as most new games require this along with direct x9 compatable drivers above click here