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The issue where the Intel® HD Graphics control panel will not open with version .4501 is under investigation, as soon as we have an answer the thread will be updated.
I would suggest just staying with the 4481 drivers as they are a newer build than the 4501 drivers: 184.108.40.20681 vs 220.127.116.1101 even though the 4501 drivers have a newer date. It COULD just be an error in the version number given to 4481, but I have found it to work better than any other releases, especially in recent games like Star Wars Battlefront and Transformers Devastation. No graphical corruption anywhere, correctly showing only 1 display connected and a working Intel HD Graphics control panel located with the other taskbar icons.
have you tried completely uninstalling the intel drivers and then reinstalling them from Microsoft's servers using device manager?
i did a clean install last night on a new drive and by upgrading the drivers through device manager, I was able to get properly working .4501 drivers and Intel HD Graphics Control Panel.