Warwickshire duo Ian Bell and Jon Trott helped England to an eight wicket victory at The Oval.
With Alistair Cook making 112, Coventry born Bell chipped in with 53 and Trott an unbeaten 43 as England reached 239-2 in reply to West Indies 238-9 with 30 balls to spare.
England lead 2-0 and the final one day international is at Headingly on Friday.