SQL server installation step by step: 

This Article point to SQL server 2012 32bit express version installation but can be use for any other version from 2012 till 2017. 

1.  Download the software from Microsoft at the following link; http://www.microsoft.com/en-us/download/details.aspx?id=29062 
   
1. Select Download. 
   
2. Select the file ENU\x86\SQLEXPR_x86_ENU.exe
   (this file contains both the 32 and 64 bit versions) 
2. Run the installer, right click the file and select “Run as Administrator”.
   
3. Select New SQL Server stand-alone installation:
   
4. Accept the License Terms and press NEXT:
   
5. At the Product Updates screen select NEXT:
   
6. On the Feature Selection screen insure that Database Engine Services are enabled and the other options are not then select NEXT:
   
7. On the Instance Configuration screen, enter “Veritrax” without the quotes for the new instance name as shown in Figure 5 then select NEXT: 
   
8. On the Server Configuration screen enter the Account Name to NT Authority\system by typing it as shown the then select NEXT:
   
9. On the Database Engine Configuration screen change the Authentication Mode to Mixed Mode and TYPE the following Password in both blanks;  Bod33|en17?ha! 
   
10. On the Error Reporting screen just select NEXT:
    
    After this step, the actual installation will run.  This will take several minutes even on a fast computer.  Do not interrupt the installation or cancel it as a partial installation can be very difficult to recover from.  Several different screens will come up as the installation progresses, be patient until the complete screen comes up
11. If the installation works properly you will get the following screen showing all of the components installed, just click CLOSE to exit the installer:
    

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