Having the same issue. I can scroll in every other browser on my computer. Chrome, IE, Firefox, Opera, Rockmelt; all of them no problems scrolling but Safari just won't scroll.
I only typically use Safari on my Mac at work and I've had this issue for over a year but decieded to give Safari on Windows another shot. Seems to me that Apple's Safari is the tit to Microsoft's IE tat.
I suppose Safari is officially a Mac-only browser. May be for the best. It's not like the dictionary, swiping gestures or double-tap to zoom features exist in Windows.