The new Start-Button is as bad or even worse then the original malformed concept of windows 8.1
If you really want to use it, i recommend to install "Classic Shell" anyway.
If not, stay with windows 7 ... there is no real reason why windows 8 is something, that anybody really needs who has windows 7.
9600.16384.WINBLUE_RTM.130821-1623_X64FRE_ENTERPRISE_EVAL_DE-DE-IRM_CENA_X64FREE_DE-DE_DV5.ISO (64-Bit) (http://care.dlservice.microsoft.com/dl/download/1/B/E/1BEDF444-0504-4694-A738-4005AAD16887/9600.16384.WINBLUE_RTM.130821-1623_X64FRE_ENTERPRISE_EVAL_DE-DE-IRM_CENA_X64FREE_DE-DE_DV5.ISO)
9600.16384.WINBLUE_RTM.130821-1623_X86FRE_ENTERPRISE_EVAL_DE-DE-IRM_CENA_X86FREE_DE-DE_DV5.ISO (32-Bit) (http://care.dlservice.microsoft.com/dl/download/1/B/E/1BEDF444-0504-4694-A738-4005AAD16887/9600.16384.WINBLUE_RTM.130821-1623_X86FRE_ENTERPRISE_EVAL_DE-DE-IRM_CENA_X86FREE_DE-DE_DV5.ISO)
Download Windows 8.1 (http://technet.microsoft.com/de-de/evalcenter/hh699156.aspx)
Free E-Book on Windows 8.1 (http://blogs.msdn.com/b/microsoft_press/archive/2013/10/14/free-ebook-introducing-windows-8-1-for-it-professionals.aspx)