Multimedia Class Scheduler refusing to startup

Hey, this problems been bugging me for the last couple of days, when turning on the computer its been incredibly slow to login and I cannot open anything once I've logged in I.e. steam, itunes, skype
After looking through the internet I've narrowed down the culprit, when looking in services.msc I noticed that multimedia class scheduler was stuck on *starting* although all other processes had started. Any help would be greatly appreciated
 
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