1) There should be an option in the control panel - mouse - touch pad (or name of touch pad device or software) that has an option to disable the trackpad when a USB pointing device is present. I haven't used an Inspiron in ages, but it may also have a button near the touch pad that you can push when you attach/remove your mouse to disable it.
I have been through all the control panels I can find and haven't found anything that even mentions the touchpad except a list of what laptop includes. I'll disable the new mouse and try again to see some way to access the touchpad....
2) If you are running Windows 7, make sure the dial-up connection isn't set as your default connection.
I'll give it a try, but it seems to me the problem is the fact that it's trying to connect at all. If I change the default won't it just try to connect to my neighbors wireless?
3) BIOS settings should be explained in the owners manual available
here.
I downloaded the tech manual this morning and the only BIOS information is what one is and how to update it (it said it would take 27 hours!). The link for the service manual was empty...
4) You can configure your Windows updates to only notify you, and then download them when you are on a broadband connection. Or have a friend burn them to a disc and snail mail them to you