Adobe Photoshop CS4 favors Windows Vista slightly, though differences this small are occasionally seen between consecutive runs. That is to say, it could be by chance.
In 3ds Max, the difference between Vista and Windows 7 is once again only one second, even though this shorter benchmark makes it appear larger than it had in Photoshop. With number rounding, a difference of less than a second could still be by chance.
AVG appears to favor Windows 7, but once again a difference of less than a second (after rounding) could also be by chance.
In a more definitive benchmark, WinRAR favors Vista. Meanwhile, WinZip does not.