10.7.2 update messed up wifi connection

Did the recent update of osx lion messed up your wireless connection? I have a friend who has an old imac computer. According to him it did not allow him to connect to his secured wifi connection. He is only able to connect an unsecured wireless connection. The only way for him to connect to his wifi is to remove the password associated with his wifi connection. Is there a fix for this one?

Depending on how old the machine is, it is hard to say.  Machine ID in Apple menu -> About This Mac -> More info under the hardware tells you its age:
iMac 5,1 and later supported 802.11n, 802.11g, 802.11b
iMac 1,1 and PowerMac 6,1 and later supported 802.11g, 802.11b
PowerMac 5,x and earlier 802.11b.  Only those which are on 802.11b don't support WPA2, and an ethernet 802.11g or higher bridge is recommended for connecting to secure WiFi.
If his iMac is of the right age, is the wireless router setup to accept the Mac's Media Access Control address on its setup?  Some routers are specific to which hardware can connect and you can control that.

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