First, I used DriverBoost to detect if there were any incompatible drivers, before posting this thread. (Because I was having bsod's at that time too when using Teams, so I thought maybe this program could find any incompatible drivers. It found some old drivers and updated them.)
Then, when you said that I should remove it, I removed DriverBooster. Also, my PC had 6 GB of RAM but only 3.24 GB was usable. When you said that there is a problem with RAM, I created an USB media and updated my 32-bit PC to 64-bit with a clean install. And didn't even download DriverBooster. I used DriverBooster before the clean installation.
Thanks