Just go to each individual component site and download the latest driver for your motherboard, video card, sound card, nic and any other device you have installed. It is very simple to do. Always load the chipset driver for the motherboard first! Then the rest. I don't trust Driver Agents at all.
When you install the new processor make sure you reset the bios or it may not boot at all. Make sure the processor you buy is on the QVL list for that motherboard or it won't boot.
+1, very good advice!