I did a restore on my laptop yesterday, and now it won't allow me to open most of the apps on my Start screen. It tells me my "developers license has expired". I went in a did a resync and that didn't help, so I decided to uninstall and reinstall. It lets me uninstall, but when I try to reinstall I get the message "your purchase could not be completed error code 0x800700c1. I'm stuck.