When installing Sage 200 client on local PCs i recieve the following error:

I have read that this could be due to the certificate not being on the local PC, however i have since copied the certficate to the PC and i still get the same error message.

Does anyone have any other ideas? I am sure it is going to be a network issue as the Sage 200 client runs form profiles signing into the server, just not when it is on a local PC. :(