Nvidia does not play well with Win 10.
Get the latest drivers from Nvidia, if that doesn't work, reinstall the driver you had before on whatever OS you had.
If that still doesn't fix it, go to Nvidia and start going backwards down the revision list and try each one until you find one that works.
Which ever one you finally find that works, do a clean install of it.
Some say the Geforce Experience app works OK.
Also make sure that you have disabled the setting for Win 10 to update drivers.
Bill