Or you can use msconfig which is already in the OS...not needing to add any outside utility.
Simply type msconfig in Search (above the Windows orb)
You will see a Start-up tab & a Services tab.
Things running @ Start-up or in the background are only only 1 aspect of factors that can slow a machine. But, certainly a good place to begin. If, as I said, the junk/unnecessary files are not kept cleared, that too can bog down a machine.
Regarding the MAC address... if, you are going to do this yourself, w/out calling the router's Support Desk... in the router's site there should be a selectable setting saying "Clone MAC Address"... select that & hit Save.