Despite the marketing, the updated versions of the C&C games in Command & Conquer: The Ultimate Collection aren't 100% fixed and still cause problems when they are installed on modern operating systems like Windows 7, Windows Vista and possibly Windows 8. With this in mind, Bibber has made his own custom fixed launcher programs for Generals and Zero Hour, Tiberium Wars and Kane's Wrath, Red Alert 3 and Uprising, as well as Tiberian Twilight. These new launchers fix some registry entries and let command-line parameters (e.g. -ui -win) pass through.
If you want try these custom fixed launchers you can download them from this thread on the Official C&C Forums. They have been tested with the English (US) version of Command & Conquer: The Ultimate Collection.