Note that seems to happen with other software, too, such as Adobe After Effects:
(source: https://community.adobe.com/t5/after-effects/a-bunch-of-horizontal-green-lines-won-t-go-away-on-my-composition-screen-when-i-open-up-any-video/td-p/11223965?page=1)
There are lots of complaints for this latest Intel graphics driver causing these green horizontal lines appear in various software - see these: 1, 2, 3, 4, 5.
Recommended solution there is to either upgrade or downgrade your graphics driver to a different version that does not have this bug (but before that, trying to delete Slicer application settings .ini files would worth a shot, too).