You may try and turn off the Graphics processor from the Lightroom preferences and check if that helps.
Open Lightroom > Edit menu > Preferences > Performance > Uncheck the GPU > Restart Lightroom.
Mohit, I've said it before and I'll say it again - why doesn't Adobe turn off Graphics performance by default, and leave those few people who need it to turn it on? That would save loads of problems and answers to turn it off!!!!!