i get a errror install desktop agent

Im installing desktop agent  from a 4.0.3 crs server and I get an error

 

“an error occurred reading the registry key APP Version.  Setup will exit.  R20;

 

 

Now I already had desktop agent and supervisor installed on the pc for another project and it was working fine. ; I uninstall the agent so that I could start fresh and this is the error

 

 

James D. Grace

CCNP CCNA MCSE MCDBA

Sr. System Engineer / Professional Svc.

Digitel Corporation