>Recently, RealPlayer has been released with a new version. So, by default, we keep receiving this notification occasionnaly. So, for now, I don't want to upgrade. So, I click Remind me later. However, it keeps bugging me to upgrade several times per day now.
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>How can I disable this?

There are 2 place is could be, StartUp group, or, most likely in the registry at HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run [at least in Win98]. You can go to this key, do an export of this as a back up. Then delete any junk from there that you no longer need. This could really make your bootup faster [depending how much you clean out]. If something goes wrong all you have to do is import the exported REG file you created, and try again.

Usually, these values are called something like REMIND or NAG.