With the exact same installation files I installed Word 2003 and WB 2011 on a Vista and an XP laptop. On the Vista machine, WB's interface has much less color, as can be seen here:


Of course I checked and double checked that both WB's were set to the same interface, Modern. In the Classic and Standard setting they look the same, but in Modern there is a big difference - under Vista only a slight gray-white gradient, while under XP a colorful blue gradient is added. How can I get that in Vista, too?