Two things come to mind: One, you may have something corrupted/upset in the Corel suite. Next time you start up CorelDRAW (or PP, whichever is giving you the problem), hold down the F8 key and answer 'Yes' to resetting to defaults.
If that does not help any, then Two: Check with your IT people and ask them what updates they may have done to your Windows workstation O/S in the last four months (and possibly your server where you have stored the files on the network) and see if they could back them out, one by one, until you find the guilty culprit.