I advice you should try update your NVIDIA drivers (also, your problem remind me I had to update my display drivers too, so I have just did it
) ad your system before disabling anything.
Look up Windows Update, because there should appear something like "NVIDIA drivers update" (I suppose it because I haven't found any information about version 176.44, only later versions) as optional update. You can manually download the updates from here:
http://www.nvidia.com/Download/index.aspx?lang=en-us.
In addition, you should ensure that your system is up to date, i.e. you have all updates and Service Pack 1.
If this procedure doesn't solve either your problem, I'm agree with you, you should only disable media center library and hotkey service, but you should learn before how get these startups back if any problem appears (for example, if your computer is unable to display anything, you should boot on VGA mode, etcetera).
I hope this helps you!