Operating system error 32(The process cannot access the file because it is being used by another process.)

Errror :

Unable to Open the Physical File: "C:\Program Files\Microsoft SQL Server\MSSQL11.MSSQLSERVER\MSSQL\DATA\Crm_MSCRM.mdf". Operating System Error 32: "32(The process cannot access the file because it is being used by another process.)".

this is a general error which occurres while trying to setup dynamics crm.

i have to configure sql manager 

solution : 

1. Stop the SQL Server (MSSQLSERVER) service.
2. Delete the mdf file in the path given in error. 
3. Start the SQL Server (MSSQLSERVER) service.
4. Go back one step in the CRM installation and then proceed

ERROR 2 :

Error! The following databases already exist on the specified SQL Server: MSCRM_CONFIG

 an sql instance can have only one  MSCRM_CONFIG.mdf file.

if you plan to create a new deployment then rename the existing msconfig  database or delete it.

or 

you can choose 'connect to the existing database' to connect with the existing MSCRM_CONFIG Database.

info obtained from the link :https://community.dynamics.com/crm/f/117/t/128421