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wifi modems suddenly stop working

Hi folks, I've got a good one. Using a Netgear MR814v2 and matching Netgear MA521 card for over a year with no probs when just prior to the Xmas break the wireless access drops leaving no clues as to what the heck has gone wrong. HP laptop running XPSP2 (with some of the more recent updates but not all), and no major changes to my knowledge having occured. One day to the next the router simply stopped letting the card have access. Checked the event logs for errors, nothing. ipconfig shows MAC and all appears hunky-dory. So un-installed and re-installed the card, still nothing. Took the router and the card to my office and both work fine with other laptops. Tried them with other non-Netgear brand components (cards and bridges), works just fine. Bring them back to my home office and *POOF*, stops working again. Darn if I can figure it out. Something with XP? Configuration change somewhere way down deep in the registry? Any advanced suggestions would be helpful (I'm an IT consultant, so I've gone over all the fundamentals several times already). Just wanting to figure this out so the wife can stop harrassing me... :^)

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