After installing Nat West Bankline software on my laptop my modem stopped working. I can hear it dialling etc. and am not convinced the problem lies with the modem. The modem is connected to Com port 4 but when I look in device manager there are no Com ports listed. If I add a comm port it creates a port called Com port 5. Do I have to reload windows to get it back?
It may say that, but in reality Com4 is a kind of "software/virtual" Com Port that is part of the modem and modem driver.
Most systems have only 1 or 2 real Com ports - these are the 9 pin "D" shaped connectors on the rear of the system, and you can attach external modems (and other things) to them. Internal modems don't attach via real Com ports.
The reason that if you add a comport yourself it creates a Com5 - is because that's next in line after the Com4 port that belongs with the modem. You can't create a Com port for the modem in that manner.
I suggest that you go to Device Manager, remove the modem, and remove any other devices relating to it (I think they are shown as things like HSF, or Simple Serial devices - sorry I don't have a modem any longer, so I can't actually check).
Then re-install the modem (which should ask for the CD in order to install the drivers) - and see if that wakes it up.