SQL Server 2012 Evaluation (x64 bit) does not install

Hi

I downloaded the following files from the site: http://www.microsoft.com/download/en/details.aspx?id=29066

SQLFULL_x64_ENU_Core.box

SQLFULL_x64_ENU_Install.exe

SQLFULL_x64_ENU_Lang.box

i have  double-clicking the executable to SQLFULL_x64_ENU_Install.exe ,i got error popup box as below

popup box name :Unloading the box

error message:The application cannot find one of its required files,possibly it was unable to create it in the folder.please make sure that

the folder in which application was downloaded is accessible and not read-only

os : windows 7 home basic

i am the adminstator in the machine and tried to copy the files to diffeent drives and click the exe

but still its stays same error message

can some one please suggest on next steps

Thanks