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http://www.ehow.com/how_5216302_riven-working-windows-xp-vista.html
That article helped me alot! My Riven game kept crashing but I did one of the steps now its working perfectly.
I highly recommend Step 6 for those with newer computers. This works in Windows 7 also.
Also, try changing the Windows theme to "Windows Classic".
Post edited May 27, 2010 by salam3133