All your files are here:

http://downloads.dell.com/published/pages/alienware-x51.html

what files do i download as my lights still go white for a few seconds then turn off and in the command center their is nothing to set the colour of the lights or to keep them on

You said x51-R1, so looks like this is the last version validated for your machine:

https://www.dell.com/support/home/us/en/04/drivers/DriversDetails?productCode=alienware-x51&driverId=P1K0M