R610 PCI Serial Port Driver

We recently uninstalled the drivers for a modem (COM, PCI Serial, etc.)  We have the vendor Modem Drivers and they show as "installed" according to the vendor executable.  However the PCI Serial Port has the yellow exclamation mark.  If you choose to update from the Microsoft driver repo it fails to find any usable drivers (no driver found).  

Is there a download I should grab from the Dell Driver downloads page?  I don't see anything that specifically mentions the PCI serial port.  What driver download would it be bundled with? Thanks.