You can actually download and burn a DVD of W7 SP1. See this
THREAD, but be sure to get the version that matches your version.
Have you already tried going to Control Panel\All Control Panel Items\Programs and Features ... Turn Windows Features On or Off ... Then under Media features unselect Windows DVD Maker and Do you want to continue "Yes". Reboot if it tells you to then come back and turn it back on. See if that resolves anything. (It may not actually uninstall anything so this may not help but it's worth trying.)