"yes I am not able to see the process in task manager"
I'm a little confused. Can you? or can you not? I mean after you press "Start Recording" in the recording dialog, is there a mstsc.exe process at background?
If it's not there, maybe you can try to manually locate mstsc.exe (there should be 2 version of mstsc.exe, 32bit and 64bit, please try them oth), or you can also copy a 5.2 version MSTSC (from google).