Scrolling in the iTunes App Store

Hi,

Ever since I updated to iTunes 10.4 I've been having scrolling problems in the iTunes store. For example when I scroll down through the Top Paid iPad Apps page, it stops randomly and the scroll bars disappear. To get out of this, I have to click on an app then return to the previous page to refresh. I have tried reinstalling iTunes but it didn't help. My mouse isn't out of batteries either. I am using iTunes 10.4 x64 on a Windows 7 machine. Any help would be appreciated.