eMclient is geïnstalleerd op mijn PC, alles op de normale manier , maar geen emailscherm

Er is mij vanuit het NL Computer Forum geadviseerd eMclient te installeren en dus te gebruiken. De eMclient is geladen, het scherm op profiel, enz. Bij te werken verscheen en is ingevuld. Maar er is geen officieel e-mail scherm waar je kan binnenhalen en verzenden, kortom hij start niet. Op het scherm verschijnt het volgende:

It appears that your database may be corrupt. You can restart Windows then rename the database directory. After that restarting eM Client should work.

The database directory is C:\Users_username_\AppData\Roaming\eM Client. You may need to enable hidden items in Windows Explorer to get there.

Thanks Gary Curtin. My English is not best, certainly not written. But I try.
I get no answer from the support, I will first try the eMclient but for a answer I must first buy it. 
I don’t buy software what will not starting now. You are the first that answer me, thanks. I will try your advice. Thanks again.