@regalman, unfortunaly HP doesn't seem to be updating the drivers much. There are however two drivers slightly newer than the one you had
here
Try the one dated 11-18-2011
at the least it should bring Civ5 back
.
There is no updated sound driver
There is also an updated BIOS that says it fixes some memory problems, usually I don't recommend people update the BIOS if they are not having specific problems, but this sounds like it might be a pretty important update so I recommend doing it. However do the graphics driver first and let's see if that helps with your problems. I suspect HP is doing something with the generic drivers which is why things went down hill when you updated from Intel (boo on HP) I seem to recall going through this on my dad's old HP once though that was some time ago.
here
Try the one dated 11-18-2011
at the least it should bring Civ5 back

There is no updated sound driver
There is also an updated BIOS that says it fixes some memory problems, usually I don't recommend people update the BIOS if they are not having specific problems, but this sounds like it might be a pretty important update so I recommend doing it. However do the graphics driver first and let's see if that helps with your problems. I suspect HP is doing something with the generic drivers which is why things went down hill when you updated from Intel (boo on HP) I seem to recall going through this on my dad's old HP once though that was some time ago.