Please try the following solution:
1. Uninstall RealPlayer as explained here: Uninstall and reinstall RealPlayer on Windows
2. Next, delete the RealPlayer application folders as explained here: Delete the RealPlayer application folders (clean uninstall)
3. Now run the following Microsoft Fix-it program: https://support.microsoft.com/en-us/help/17588/fix-problems-that-block-programs-from-being-installed-or-removed
4. Restart your PC.
5. Download a fresh copy of RealPlayer by visiting: http://www.real.com/