Error: 'Some or all identity references could not be translated

Hi,

Am trying to install AIF, and am new to Dynamics AX, and kindly help me. Am getting the following warning…

WARNING: Setup could not set security permissions on content folder ‘D:\Program Files\Microsoft Dynamics AX\50\AifWebServices’

Error: ‘Some or all identity references could not be translated.’…

Please help someOne…

Thanks