I dont even know what Virtualbox is or what it does, but it has trashed my system

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http://forums.fedoraforum.org – I have tried unsuccessfully researching this problem, so now I am unfortunately having to spam you. My yum is completely broken now. http://download.virtualbox.org/virtu...ta/repomd.xml: [Errno 14] HTTP Error 404 - Not Found Trying other mirror. Error: failure: repodata/repomd.xml from virtualbox: [Errno 256] No more mirrors to try. Im not even sure when I installed virtualbox, I can tell you I will never have a use for it - and its crippling my yum. I cant download or update anything. What do I do? (HowTos)