No Internet connection on wireless with WPA after 10.4.10 update

After the 10.4.10 update I can't connect to my network that uses WPA encryption. I'm able to connect to the router fine and ping computers and the router in my network but I can't view any websites. DNS to outside websites works too. I can view websites fine from my windows laptop connected via the same wireless router. Internet does work on my mac when I connect via my neighbor's open wireless connection so that's why I figure that encryption is the issue.
I have searched and read other posts on the forum and done what the recommened... I deleted the keychains related to my wireless router and deleted the router from my preferred networks then re-added the router. I have also run the permissions repair and reinstalled the 10.4.10 update. Nothing has helped.
I'm a mac newbie so if I'm missing any information that could help diagnose, please let me know.
Thanks!

I have a wifi-related problem with 10.4.10 as well. Everything works fine when I'm plugged in, but when I switch to battery power, I can use the network just fine for a while, and then I'm cut off. I'm still connected to my wireless network, but no data comes in. Data input is restored once for a brief period, but then it dies completely and the only solution is to reboot. I'm having this behavior on my C2D MacBook (2GHz, 2GB), and a workmate has been complaining about a C2D MBP and a C2D MB dropping their wireless connections after the 10.4.10 upgrade. So it seems like something's borked on the wireless side.
I'm going on a two-week trip on Sunday and in the destination I'll depend on the wireless, so anyone with a quick solution has just earned him/herself a beer

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Step 2
If you're running OS X 10.8.4 or later, run Wireless Diagnostics and take the remedial steps suggested in the summary that appears, if any. The program also generates a large file of information about your system, which would be used by Apple Engineering in case of a support incident. Don't post the contents here.
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