problem when i want to add client to dp 7.00 build 100

hi

i have problem when i want  to add client to dp 7.00 build 100 .test to 4 windows client  2008 r2 enterprise.

[Critical] <srvxxx.xxx.net> Error 1935.An error occurred during the installation of assembly component {76FD497D-2E11-32A3-8941-82621BCB166E}. HRESULT: 0x80070BC9.

win DP 7.00 is 2008 r2 standard session client 2008 r2 enterprise

what is problem?