Help! Quick! PLEASE!

[wakaz]

I have check the troubleshooting guide but I don't think it helped. I checked my hpl and it said this:
"ATTENTION: System does not support const arrays in glsl!
Setting up G-Bugger: type: 0 texturenum: 3
ERROR: Drivers does not support packed depth and stencil!
ERROR: Drivers does not support packed depth and stencil!
ERROR: Frame buffer 'Deferred_GBuffer_Depth' is not complete! Missing attachments!
ERROR: Could not create frame buffer with only depth for Deferred renderer type: 0!
FATAL ERROR: Renderer #0 could not be initialized! Make sure your graphic card drivers are up to date. Check log file for more information."
But I don't know how to update my graphics! I am on a x64 Windows HP system(I'm guessing) and it is a few years old. It works well but when I co to play the game it says:
FATAL ERROR: Renderer #0 could not be initialized! Make sure your graphic card drivers are up to date. Check log file for more information.
Help?
I have paid for this game and I really want to play it!