My 11.6 inch Windows 8 tablet Acer Iconia W700(I5 Core) is very slow and laggy and i tried everything to get it back to normal again but still not good. So i thought the only option is to factory reset my Windows 8 tablet the option "that you refresh your PC without affectin your files" i pressed on it and after couple minutes(perparing) it said "Insert media Some files are missing. Your Windows installation or recovery media will provide these files" i dont really know where to find the Windows installation or recovery media. So where do i find them files to factory reset my tablet? And what do i need to do before i factory reset my Windows 8 tablet? because i am a complete newbie when it comes to factory resetting Windows 8 tablets and will be my 1st time doing this and when it comes to factory resetting my Samsung Galaxy Tab Pro 8.4 it is simple and fast.