Can't see my wi-fi on mac pro

It has been a while since I have used Wi-Fi on my MacPro since I was connected via ethernet. I used to be able to see the Wi-Fi icon in the upper right hand corner of my task bar and I could select a network. Now, that icon is not there and I am unable to select Wi-Fi as an option to add under System Preferences/Network. Wi-Fi is not listed and I am not able to add it on the left side since it does not give me Wi-Fi as an option to add as an interface, only Ethernet 1 and 2, firewire, PPOE and VPN.
If I go to Utilities applications and look at System information, it does show that I have a WiFi card.
How do I turn it back on?
Thank you.

Good advice, applying the combo may help...
1058 Combo Update, 10.5.8...
http://support.apple.com/downloads/Mac_OS_X_10_5_8_Combo_Update
Also, under the Apple icon at top left>more info>Network... is Airport listed there?
Then, Apple icon at top left>more info>Software>Extensions, is there something like this mentioned?
AppleAirPortBrcm4311:
Version:    3.6.7
Last Modified:    11/24/08 06:11
Get Info String:    3.6.7, Copyright © 2006–2009 Apple Inc. All rights reserved.
Location:    /System/Library/Extensions/IO80211Family.kext/Contents/PlugIns/AppleAirPortBrcm 4311.kext
kext Version:    367.91.22
Load Address:    0xfe0000
Valid:    Yes
Authentic:    Yes
Dependencies:    Satisfied
Integrity:    Kext has no receipt

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