Not exactly sure what you're trying to do here. Playing online videos requires mostly Flash, for QuickTime specific formats (like iTunes trailers etc.) you can always use QTLite, an alternative to the actual QT which does not install the actual player, just enables support in your web browser.
Even for offline videos, QuickTime is a very, very bad solution. Again, QTLite can do it instead, and should be able to play them in WMP, online or offline. Use Revo Uninstaller to uninstall and erase all traces of QT then install QTLite.