First, click on the link below to install and run the Microsoft troubleshooter. Run it a few times until you remove all Real and RealDownloader entries from the list.
Then, install RealPlayer in Safe mode by following these instructions: https://customer.real.com/hc/en-us/articles/231760587
NOTE: For more information on how to boot up your PC in Safe Mode, please consult this video: https://www.youtube.com/watch?v=L_N9riV8jl0; additionally, make sure to select the ''Network'' option under the ''Safe boot'' option:
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