If you have Lightroom CC 2015 installed on the computer, you can safely uninstall Lightroom 5 once CC is up and running to your liking.
IF when you put in the memory card, Lightroom 5 automatically opens, you can either A. uninstall LR5, or B. Change the Lightroom 5 preference (Import options under General preferences) to not open the Import dialog when putting in a memory card.
Let us know how it goes.
Worked a treat, thank you.