Will help you change the collation.It is good that you have backed up the database and scripted out all the user defined jobs associated with the instance.Also script out the user logins.
If you have customized any other setting at the server level then make note of them.Run sp_configure to get all the server level setting.
The command to change the server level collation is to:-
Setup /QUIET /ACTION=REBUILDDATABASE /INSTANCENAME=InstanceName
/SQLSYSADMINACCOUNTS=accounts /[ SAPWD= StrongPassword ]
/SQLCOLLATION=CollationName
This will basically rebuild the system databases with the new desired collation.This method is faster than reinstalling SQL Server.
refer the below link