I decided to do a very stupid thing - I installed NVIDIA updates. First, my computer was completelly out of order, but after restoring it, it can be used at least. But some problems still remained, and one of them is the fact, that I have all text in my browser (mozzila firefox) bold.
Here are three screenshots:
PS.: Editors, pleave leave images as links. Thumbnails of this images will be useless, so its a waste of space and bandwidth.