The first step is the safe mode and ty to find whether it works there or not. The second step is to do a clean boot (to go to clean boot type in msconfig at the sratup search)with selective start up and in selective start up uncheck load startup item & load system services.On the services tab click on hide all microsoft services and disable all the other items over there.
And then go to start up tab and disable all the start up items and restart the computer. If it works well then do a divide and conquer with the start up and the services items. Once found uninstall the software from the p.c.

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