Just to add to Neemobeer's post, if your getting freezing particularly when playing video's then use the DDU to remove your gpu driver (this it does in safe mode) which will also remove anything else left behind by previous installs:
Display Driver Uninstaller (DDU) V17.0.3.0 Released. - Wagnardmobile Forum
Once removed install the most recent gpu driver.
Nvidia 375.70 WHQL
Find command prompt, right click on it and run as admin. Type:
sfc /scannow
Press enter and await results.
If the freezing continues please remove the overclock and see if the issue stops.
If it doesn't stop run a chkdsk
Link Removed
Check your RAM
Windows does have a memory testing app but it can miss errors and the best app for the job is...