Scope - I think it is far more likely to be your system than a particular PD7 issue, but tech support should be your first avenue.
If that doesn't work - given that you've already tried the uninstall/re-install option - my suggestion would be to back up your data (if not already) and do a complete system restore.
If that doesn't work, a dirty great big group cyber hug will be needed!
Good luck with it.
Cheers -
Tony
