Hp pavilion d4790y windows vista cannot connect to internet wirelessly unless using WEP

I have a HP Pavilion d4790y with Windows Vista 32 bit home premium.  I can connect to my ISP router wirelessly using the HP internal network adapter, but the connection from the router to the internet does not work unless I downgrade the router security to WEP.  If I connect to the router with a wired connection, I can connect to the internet no problem even with WPA2.  I have done all the recomended troubleshooting steps like resetting the router, checking for network adapter driver update, uninstall/reinstall network adapter driver, release and renew the ip config, etc.  Suggesions?  Is there a more recent driver that is not being recognized during the update search process?
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Hi,
This is a hardware thing and the wireless card does not support this. Changing the wireless card may be the way to go.
Hope this helps.
BH
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