is a USB modem, and connects to one of your computer's USB ports - you don't need a network card to be installed in the machine. There have been some problems with this modem when connected to a motherboard with a VIA based USB controller. The VIA chipset has a limit of 500mA power drain to the USB controller, and will shut down the device if it detects that more than this is being drawn. Although the 330 is supposed to draw exactly that, there have been reports of it drawing 570mA, and therefore being repeatedly shut down.
I don't know if this applies in your case, but if you
click here you can at least download the latest driver and try that. Otherwise you could try installing a PCI USB card with a couple of extra ports - that sometimes solves any problems.