ALM Client registration issue- RRV.cab file has no digital signature

Hi Members,

We have been using HPQC (ALM 11/Patch13)on a server.

We have added few users to HPQC.

While the new user tries to login to HPQC for the first time , he is getting the below error .

Following client components were not downloaded successfully:

1 . RRV.cab :
This file has no digital signature or the publisher is untrusted.

Close all connections to Server and try again.

I have created the issue in my system by deleting QC session from users/xyz/AppData\Local\HP .

The ALM client is not installing in my system. 

I have tried the following to put a check to the issue. But none of them worked .

Can some one please drive me towords the solution.

1. I deleted all temp files.

     Deleted RRv.cab file from C:\Users\xyz\AppData\Local\Microsoft\Windows\Temporary Internet Files 

     Reinstalled with Admin prevelages. 

2. HP QC plugins page /HP ALM client registration  also did not helped.

3. Copied RRV.cab file from the other mechine that is working perfectly. And pasted the file in C:\Users\xyz\AppData\Local\HP\ALM-Client\qc11. 

Even pasted the file in C:\Users\xyz\AppData\Local\Microsoft\Windows\Temporary Internet Files while the application is loading.

4.As a final option i am copying entire HPQC client from working system to my system under C:\Users\xyz\AppData\Local\HP\ALM-Client\

Thanks &Regards 

Srinivas G