First things first, there is a video from the glitch: http://sdrv.ms/1ezUUkc
I first tried to update the graphics drivers through the Device Manger with the search drivers on the internet option. It has found a newer driver and started installing it, but suddenly the screen have gone black and the device rebooted after a half minute.
I tried it once more with the same results.
Then Asus LiveUpdate application popped up, it installed some drivers (it hasn't specified which ones), and rebooted the computer. Which went fine, but the glitches persisted. Then I saw a Windows Update called "Intel(R) Corporation driver update for Intel(R)
Graphics Media Accelator - Windows 8.1", I installed it. It also caused the screen to go black, but after a couple seconds the update finished successfully.
On side note I have seen a dramatic improvement in framerates after the 8.1 update in games and in freshpaint (which were barely usable before). Now the speed is right, but time-to-time I run into flickering triangles on the Modern UI, which I have not seen
on any UI a long ago. Fortunately app swicthing or random tapping usually solves the problem, but I hope this will be fixed. I also understand that this might be Intel's fault too, they have never been the best in graphics drivers.
Also in freshpaint drawing causes random white lines and triangles to popup all the time, if I use undo, then most of the things I have painted are replaced by random memory garbage, which can be shuffled by the fan (it looks like some sort of modern art
by the way, look at it: http://sdrv.ms/1c5jGeE, I have only used blue).