OpenGL isnt working!!

HY i have a Pentium 4, 1.6 GHZ,256mb/ram,45HD AND A Nvidia RIVA TNT2 MODEL 64 AND ONE DAY I WAS PLAYNG GAMES NORMALLY,BUT IN THE NEXT DAY IT WASNT WORKING ANYMORE WHAT IS HAPPENYNG??? I NEED TO UPDATE MY OpenGL??,IF I NEED CAN YOU PLZ TELL ME THE LINK OF THE DOWNLOAD??

Could you please elaborate?

Did you install something? Are games crashing? Which games?

More info needed.

(By the way, I highly doubt it has anything to do with OpenGL.)

Of corse all my games keep crashing but if i installed something that is causing the problem i dont know whay program is this and here is some of the games that are crashing:
MOHAA,COUNTER-STRIKE,RETURN TO C WOLFENSTEIN ETC…

You need to tell us something more useful than “IT WASNT WORKING ANYMORE”. Are you getting an error message? Does the computer randomly reboot, or does the application unexpectedly quit? What is your definition of “crashing”?

If all else fails, try reinstalling your graphics drivers. Behold:
http://www.nvidia.com/content/drivers/drivers.asp

If that doesn’t work, you might have a dead memory chip or an overheating problem or something - you might want to contact the computer’s manufacturer and see what their tech support say.