Originally Posted by Common Courtesy
Unintall and reinstall it.
Priority are built intothe application itself and set at startup.
One can change the priority after the app is running.
Only other option would be to try to hack the app by locating the proper byte in the executable and changing it.
Placing things above normal that are either CPU and/or I/O intensive can drastically affect the way the overall system runs
Processes can change their priority, only down if you're non-admin AFAIK, however reinstalling them won't change that. If they do it, they do it and that's all there is to it.