Symanetc Enterprise vault outlook Add-in (Error installing)

Hi All 

Have a strange one here on a users machine, the other day they could not load their email in oulook 2007 from archive. 

The other support person recreated their profile uninstalled the ev client 10.0.4.1189

I then recieved the device. 

I went into safe mode and uninstalled any left overs of the EV client rebooted into normal mode and tried to resintall client.... When i do i get the following error message

Could not delete ket \SOFTWARE\Microsoft\Windows Search\Gather\windows\Systemindex\protocols\evoffline3x. Verify the you have sufficeient access to that key.

I can see that the user and local user cannot access those keys and cannot delete them i cant even add them to the folder.... So it appears to be some corruption. the user in on Windows 8.1. they have been using the client for 2 yrs... (very bizarre) if anyone has any ideas would you please be able to assist.

Regards