Here's a copy of my reply to another post regarding re-install of CoD, hope this helps others.
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I'm one of those that has unistalled and re-installed CoD mainly because I had "Launcher" problems that a lot of us have been troubled by. Everything going ok so I decided to remove some nolonger required programs from my PC then I started having "Launcher not working" when trying to get CoD started. Tried to get suggestions to fix it from steam support but everything they suggested didn't work. A re-install of SP1 with W7 finally got every thing working again ok. My only assumption is that during the unistall process of the unwanted programs that some shared Dll's were removed and the re-install of SP1 fixed the missing Dll's. Supprisingly I now seem to have slightly smoother game play and a small fps increase.
Rick
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