[Winamp 5.5]

I'm using /S to keep it quiet, but I'm wrapping it in an NSIS executable to uninstall the junk after the installation is finished. I'd love to hear of a more efficient way of getting rid of the unneeded stuff.

[IE 7 - Breaks RunOnceEx?]

This is occuring due to a change in the iernonce.dll file. You can still launch the RunOnceEx process by copying the IE6 version of the iernonce.dll file into any location and executing the runonceex command using it, but IE7's iernonce.dll file is the culprit. Not sure if it's by design or an unintended consequence, but that's the long and short of it.

This post bears a striking similarity to the one I posted here.