The problem event CLR20r3 may occur for the following reasons: Corrupted application files and settings. Corrupted application registry keys.
Reregister Windows Media Components
Step 1: Press "Windows + R" keys on your keyboard to open Run box, then type “cmd” in the Run box and press Enter to open Command Prompt.
Step 2: In Command Prompt, type the following commands one by one followed by an Enter after each command to execute all these commands:
Step 3: Exit the Command Prompt and restart your computer to see whether the problem is solved.