Help to Install on Windows 8.1 Proffesional

Hello every version on Unity i downloaded gives me an error during instalation.29097-error.jpg

Please help.

First the errot of NSIS I have to run CMD and run it with parameter /NCRC. Then the instalation continue and I have this error. I will check the sum. I tried to run Cmd with administrator rights. And run installer with administrator rights will creat the error.