@AlBundy33 Hmmm...this is odd. I redownloaded wmp11-windowsxp-x86-enu.exe a few moments ago (updated to 11.0.5721.5146). I try this command again and it works like a charm this time! The only thing I have yet to solve though is why I can't get setup_wm.exe within wmp11.exe (which is inside the main package) to work with those switches. Note: Since we are using the /C switch on the main package, running the switches on the setup_wm.exe inside wmp11-windowsxp-x86-enu.exe will work. However, I'm trying to run setup_wm.exe inside wmp11.exe silently. Well, thanks for the help, and sorry for jumping to conclusions. If you can solve this ^^ I'd be very grateful! @Tomcat76, maybe this will help for WMP11. Also, just in case you missed it, version 11.0.5721.5146 was released. This post has been edited.