This sounds like a conflict with something that's loading into memory when you switch on and load the Operating System.
Boot into safe mode. (F8 every half second while booting) Allow to load mode.
Go to start.
Type in search MSconfig
Go to 'Start up' tab.
Deselect anything you know you don't need from the list.
Hopefully, you'll hit the right one and the problem program won't load.
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