Database connection problem during QC installation and always prompt user name password incorrect when using system user

1. The JBoss service during installation always prompts the username password incorrectly when typing the Windows system username password domain.

Workaround:

My Computer-> Properties-> Advanced-> performance Settings-> Data Execution Protection: Select the first item, and do not select the second item. Reboot the computer and install the QC again this barrier passes.

2. Connect to database, prompt "property incorrectly attempting to connect to database with an error." Please check that the database is available and that the given parameters are correct. Click Back to correct the database configuration variable. And I can't connect with anyone else because I don't have access to my database.

Workaround:

This problem is primarily a database connectivity problem. A. The Program->sql2005-> Configuration tool->sql The server perimeter configuration-> remote connection-> Select the Use TCP/IP only option.
B. program->sql2005-> Configuration Tool->sql Server configuration manager-> Configure network configuration via disable in the protocol below, Named pipes disable; Named pipes Disabled, make sure that SQL Server restarts the service