Sitecore 8.0 - Failed to connect to SQL database(-2147467259 master)

Hi Friends,

Many of you might have faced the issue while installing  Sitecore 8.0 from .exe file.

Figure 1

Solution: SQL server installation should be done using the account NETWORK SERVICE/LOCAL SERVICE/. So you will need to uninstall Microsoft SQL server from Program manager, Delete the physical folder from C:/Program files, delete the Registry entries if things do not work. Re-install SQL server using the mentioned account and not the default account selected.