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Every time I try to launch R4, I receive the following error:

"OPENGL INITIALIZATION ERROR

Your computer is currently using a SOFTWARE OpenGL Renderer.
R4 requires hardware accelerated drivers."

I press "ok" and then Winamp instantly crashes. i have just switched to Windows 7. All my drivers are up to date.
My graphics card is ATI Raedon Sapphire HD 2400 pro.

Can anyone help me with this issue?

Thanks.

Alan