PCI Express Root Complex (Intel) turned into PCI Bus (AMD)

After installing Catalyst 15.3, my Intel PCI bus had a 2014 AMD driver instead of the default 2006 Microsoft driver. I'm pretty sure this is dead wrong, so I had to uninstall it, and redo a bunch of registry settings and so on. But what gives? Why did this happen?

PCI Express Root Complex (Intel) turned into PCI Bus (AMD)