I recently bought a secondhand wireless router (D-Link Di-624 - an old model, but seems in good condition) to try to set up a network of 2 PCs (1 Vista, 1 XP) and a Smart TV (Samsung). In looking for info on installation, all the how-to VIDEOS seem to INDICATE that the router should be connected to the ISP original modem as one of the steps in the process. I had thought that the router would be directly connected to the internet source and replace the modem and once the connection of the main PC to the internet was made the other devices could be "tuned in". Am I right to assume this? I have tried following a couple of the suggested methods but could not connect. Could anyone suggest a good step by step guide?
Any help appreciated.

You need a modem. The modem connects to the router.Some ISPs provide a combined modem/router; I have such a device from UK Virginmedia. It is a rebadged Netgear device. However, the D-Link Di-624 is not such a device. It is just a router. You can easily find out information about all kinds of hardware by using a search engine (Google is a good one). I typed "D-Link Di-624 router" as a search and GOT a list of results. About 4 results down was a link to a review of the router. Reviews are good things to read because they contain answers to most of the questions that INTENDING buyers or new owners might have. For example, this review says:

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The hardware setup is a snap, LITERALLY. Connect the DI-624 to your broadband modem with the cable that came with your modem, use the Ethernet cable in the package to connect the router to your computer, and you're done.

I recently bought a secondhand wireless router (D-Link Di-624 - an old model, but seems in good condition) to try to set up a network of 2 PCs (1 Vista, 1 XP) and a Smart TV (Samsung)...