I suggest downloading a Linux distribution and loading it on to a USB stick.
I'm not suggesting that you install Linux, but you can run it from the USB without installing it. It's what's called Live Desktop. Instructions on how to create one of these USB sticks can be found here:
Ubuntu is an open source software operating system that runs from the desktop, to the cloud, to all your internet connected things.
ubuntu.com
Booting from this and playing around with it for a little while will soon tell you if those glitches are the monitor itself or if it's because of software issues in Windows. Having one of these USB sticks set up is a very useful thing, you can use it for testing and even resolving many issues, and it's 100% free.
Ubuntu is an open source software operating system that runs from the desktop, to the cloud, to all your internet connected things.
ubuntu.com