So you where downloading something through you credit card machine you might have got a virus
the driver or software might have been corrupted
can you connect it to your computer ?

you might have to download a new driver or software

or you might be able to repair or run your antivirus

the way i interpreted this was it was connected to your computer when you downloading from the internet it crashed

check all leads that connect to your credit card machine make sure they are seculy seated and not faulty

if you can connect it to your computer

click start control panel administration tools computer management device manager scroll through all of your devices look for network adapter or being a phoneline modem

if you see a yellow question or exclamation mark ? ! or a red X you will need to update the drivers for this device right click select update driver/reinstall driver

hope this helps