version10 free upgrade7/30/15 lost access all folders extremely slow computer now. PLZ Help

[WPCentral Question]

I did the auto upgrade from ver 8.1 to ver 10, and now my computer is extremely slow and i cannot even access my settings tab it just wont open. All my desktop settings from my earlier version are gone. I cannot access my own folders. It keeps telling me I cannot access the folders. I am in a big problem situation. Please let me know how to reverse back to my older version 8.1 and undo this download or fix. N bring my access to all my folders. It just made my working computer into an extremely slow snail pace and also lost all access to my settings,I tkeeps telling me to back up but does not let me do it.No more HP settings and no access is granted to my own files/folders in the drive any more. I need This fixed asap n no online help is able to give me instructions.Please HELP to fix or revert back to my original version and files an folders access. My laptop is less than a year old and was working fine until the new version download.Please HELP