Every time I try to connect to the Mac OS App Store, it loads for about a minute (sometimes it doesn't appear to load at all), and then says "Cannot Connect to the App Store". I thought that maybe it was because I have a pretty weak wireless connection, so I went over to a friends house and tried reinstalling the Combo Update over his connection, then connecting to the App Store there. I still got the same message. He could connect instantly on his macbook. What can I do to fix this? Or at least, what is stopping me from connecting?