Not getting sitefinity website
I am not getting sitefinity site after pressing continue .I am using SQL server express.I have two instances of sql express in my system and when i am using 1st instance "SQLEXPRESS" i am getting "error1.png" which i attached with this mail and when am using 2nd instance "MSSQLSERVER" i am getting "error2.png".
please explain the error and who can i resolve it.