What did you want to know?
RNUPGAGENT.EXE is Real Networks Update process.
I had my own experience with Real Player some years ago and I got rid of it. Real player is part of the RealNetworks at http://www.realnetworks.com/
At that time, (and I will try to restrict my comments to what happened all those years ago), I downloaded the RealPlayer media player. But as soon as I installed it, it started to take over my computer, with RealPlayer and all sorts of other RealNetworks components. Things like its own control panel and constant information received from the web site.
Trying to shut it down took a lot of work as it has options all over the place. For example, preventing it from "loading at startup" took a number of attempts because that option is duplicated or triplicated around and about in options. Every time I killed a process, another one would pop up.
After a while I uninstalled anything I could find to uninstall, then I got the hatchet and began deleting all files and folders to do with RealNetworks and RealPlayer, then started on the registry.
Eventually I got control back, but it was messy.
They may be different nowadays.