It isn't that the file is infected, just that from its location and it being a dll, it is creating a registry entry item to run the RealUpgrade on the next boot.
So what you have to answer is, what initiated this command, e.g. did you just install RealPlayer or select the option to update/upgrade ?
When posting an image, please crop the image to just what is relevant not full screen, there are still people using dial-up and it cuts down on file size and the image can be opened within the topic not in a new window.