Strange problem. Webpages displayed on the 2 different Win7 laptops I have are jumbled (not formatted correctly). My XP and vista are ok. Connected the laptop directly to the cable modem....no problems. Switched over to my neighbors network....no problem. All roads lead back to the Linksys Wrt54g router, not being compatable with the Win7 OS. (problem occurs using IE, Chrome and Firefox). Anyone ever here of such a thing?
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Try rebooting your router. I have the same router but haven't seen that issue. When you see this are you connected by wire or wireless?