This arises sometimes, and we still don't understand well why.
This is usually due to the fact that you have defined big fonts in your Windows installation.
Please try to choose little ones.
You can do that in the "Control panel" / "Display", or on the Windows desktop, right-click and choose "Personnalize" or "Preferences", "Display".
Now sometimes you already have little fonts selected: choosing medium ones may solve the problem.
However in some very rare cases, this doesn't work.
In this case please contact firstname.lastname@example.org