I've had QT installed on a Win7 machine for awhile. I recently installed Armory and made it my default client for awhile. Then I uninstalled Armory, and ever since, when I start QT I only see its icon in the status bar and system tray. I can't actually see or use the client. This isn't a syncing problem, this has been going on for over a week, and I already had the blockchain to start with.