I just purchased Race Driver: GRID and I am trying to run it on Windows 7 64 bit.?

when I click the executable file, the game shows a message "The program can't start because OpenAL32.dll is missing from your computer. Try reinstall the program to fix the problem". My PC config is : intel quad 9550 processor. GTX 260 PCI-e, sound blaster x-fi titanium sound card 4GB Ram