relaying my wireless network

I have a wireless router in my house which is transfering out to my garage (converted to office) with 70- 90% signal strength working perfect. I now want to be fit to link a second pc up in the garage via the existing one. I have pci network cards in both machines pc1 has pci wireless adaptor plus network card and pc2 has just network card. I have already bridged the connections on pc1 and linked them with a crossover cable (after following some on elses advice) but i am just getting limmeted or no connectivity. any help will be much appreciated.

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