Wireless DSL modem, wired router networking

I have a Quest Actiontec DSL Modem with Wireless Gateway connected to the internet and (through its one ethernet port) a Linksys Etherfast Router. The router is in turn connected to two desktops, both with McAfee Security Center (and Easy Network). It is also connected to an HP Officejet 6500 Wireless Printer. Now, to add confusion, I also have a laptop, with the same McAfee software, that connects wirelessly with the ACTIONTEC MODEM. I want to a) Make my printer wireless. b) Solve the hidden node (or in this case, double hidden node) problem so that my computers can all see each other. A network map:
Internet
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DSL Modem (Wireless)
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Linksys Router (Wired) Laptop
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Desktop 1 Desktop 2 Printer- wireless capable