Newer Wasn't Better

My computer is considered old as computers go (7 years), but it still works great.  Hubby bought me a modem so my wireless connection speed would be faster.  The one that came with the laptop still worked, but was a little slow.  After he installed the new modem, I noticed that my computer was even slower than before.  Hubby did some of his magic, but sure enough the speeds were still slower.  As it turns out, the newer modem it too new for my computer.  He uninstalled the new modem and the speed picked back up to where it was before.