On your cab computer: are all protocols loaded? IE TCP/IP? Is the driver for your NIC loaded?
Did you use the setup wizard to set up your machine for Internet service?
You can't put IE onto a floppy as has been said. What you likely downloaded was a download installer. Pulls needed files from the 'net. They're particularly annoying, because what happens in a situation like yours? You can't do diddly.
As for the ROMs, just stick them into your ROMs folder. Doesn't matter how you got them, they're just information.