I have Windows Vista Home Premium and Ultimate, and I see the same problem.

As you can see in the red area on the right, the explorer window is not completely "full screen" to the available area.
There's some "blank space" not filled by the explorer.
I've noticed that the "blank area" is the same width the "vertical scroll bar". Could that it be related to the problem?
Please, tell me what to test.
Thanks!




