Login to new installation not working

Login to new installation not working

Hi Guys,
 
I have just configured a new ServiceDesk install as follows:
 
Windows 2008 R2
SQL Server 2008 R2
SDP 8.1
 
The installation completes fine and SDP starts up ok, however I can't login to it. When I try and login using either the "administrator" or "guest" accounts that it specifies on the login screen, I just get an error message as follows:
 
Username or Password is incorrect
 
I have opened the SQL Server management tools and can see the servicedesk database and everything seems to be pk, just SDP refuses to log me in with the defaults provided.

                  New to ADSelfService Plus?