I pulled this off of some site, but It looks about right:
Open the application for which you want to change the processor priority level.
Type “task manager” and click on Task Manager on the Start screen.
Click on More details if the window is not in expanded form.
Navigate to processes tab, right click on the application and click on Go to details.
In the Details tab, right click on the already highlighted name of the application for the process from step 4, click/tap on Set priority, and click/tap on the priority level you want to run this application or process in.
Click/tap on Change Priority to apply.
Repeat steps 4 to 6 above for any other applications or processes you wish to change the priority level of.
Close the Task Manager window.
Oh and the link for the flash projector 18.0.0.382 should be under the archived versions, when you go to the flash projecor page for older versions
Just scroll down and it should be there