New HP and home wireless connection

I just bought an HP Pavilion 3128ca to replace an older Dell 6000 that was too full. I can't connect to my home wireless router because the new system tells me the password I am using needs more characters. That is not true as I can connect my old laptop and Touch with the password I am using. Can someone help me out here. My router is Linksys G 2.4 GHz.

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