wordpress virtual host (no replies)

I installed wamp 3.1.9 on windows 10, I setup a local and virtualhost with a wordpress install and it all worked fine. I then tried to copy a hosted site to my wamp virtual host which again was fine but when I moved the database I got an error.

So I uninstalled wamp, removed all traces of it and reinstalled it, I installed wordpress on localhost which worked but it is not working on virtual host. Like I say, it all worked fine on the first install but in the second install, when I launch the virtual host I get ' error establishing database connection'.

Any ideas, I have gone through a number of scenarios and can not get wordpress to install on the virtual host.