Yes but I only picked one wireless card at random - there are loads of others. I'm sure that you can find a suitable one if you look around.
The alternative is to connect the 'old' computer to the router with a cable. This of course is only possible depending on where the PCs are located or if like Mrs VoG, Mrs Halmer has a pathological hatred of cables.
Possibly the cheapest option is comething like this click here .I have this router along with a wireless PC card and found it very easy to setup. This system will replace your current external modem and provide you with your desired wireless network.
Some people prefer an internal PCI wireless card to the USB dongles, this is also an option at the same site, you'll just need to do a bit of digging
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