remote agent uninstall/install 2010 R2

Hello 

I have a little problem with Backup exec remote agent.

The agents needs updating so I run the update but it didn`t complete. It shows that some *.msi file from C:\Windows\Installer\ is missing. 

So I then tried to uninstall the remote agent. It fails with the same error. 

So then I used this:

http://www.symantec.com/business/support/index?pag...

When I followed the procedure I found that some registry keys are already missing.  

Then I restarted the server. 

And now I cant install remote backup agent becouse it installs for over 4 hours now and still nothing. No progress no error mesages.

Any help ?