If you need your SR300 camera for work conferencing, it should still function as an ordinary RGB video webcam in communications programs such as Skype even if there is a problem with its RealSense drivers.
I went through your log but could not see an obvious cause of your problem. Has your PC recently gone through a Windows update? That is the usual cause of 'it worked fine until today' problems. Some users have been having problems after Windows started rolling out its new 'April 2018 Update' (version 1803, build 17134). You would know if your PC had installed the April Update, as there is a multi-stage questionnaire to answer once it has finished installing before you can start using Windows.
You can check which Windows version your computer is using in the System Information window. you can find this by typing 'system info' into the text box at the bottom of your Windows screen, next to the button used to shut the computer down.