Windows 7 ultimate is the software is so smooth to use I feel this Windows is better then Windows 8 , 8.1etc it make thing easier to use in office hospital etc I am using this software for more then three years we can create mor then 8 account to use it .if ther is any problem it will find itself an say to repair if it is any small problem meant it will only repair we can use any slow internet connection the browser is so fast it kills the virus and reduses hang the system update is also less mb like Windows xp but more better