Q: Why can't I browse the app store by category?

Hey massy09,

Thanks for the question. I understand you are experiencing performance issues with the iTunes Store on Windows. The following article relates to the symptoms you described, and may potentially lead to a resolution:

Apple software on Windows: May see performance issues and blank iTunes Store

http://support.apple.com/kb/TS4123

Additionally, the following resource may provide further help:

iTunes: Advanced iTunes Store troubleshooting

http://support.apple.com/kb/TS3297

Thanks,

Matt M.