I thank each responder and will summarize my efforts to follow up on each of your suggestions.
First, RF from transmissions of 7.08 to 7.250 MHz have had a history of knocking my broadband (BB) radio on the tower off line. BB comes in at 5.8 GHz and gets transmitted from my router at 2.412 GHz. I could always get my BB radio back working by power cycling it for a minute or two. My router is located about 1 meter from my ham radio and has never been affected by RF. I now ave a different model of BB radio and have no problems.
At the time my HP laptop computer was apparently affected by RF, it was probably in the search mode by being away from my router. It is unlikely that any odd harmonic from a 21.5 +/- MHz transmission being used at the time would be strong enough otherwise to damage the wireless chip in my computer. Even with a mistuned transmission system, transmitters use a "fold back" circuit to reduce 100 watts down to just a few watts, or nothing, to save damaging the finals.
Second, I have tried to get wireless working by using several different Live CDs/DVDs, as suggested. I have never had any success with either SL-5.0 or SL-5.3 Live versions but have found that wireless could be set up once the OSs were installed. They did not work this time either.
In the past, I have been able to set up and use wireless from Live versions of: Puppy Linux; PCLOS; Ultimate Linux; and MEPIS. These systems all seemed to be working again, -they all detected my wireless system, but none of them could complete the connection. Wireless remains disconnected with all OSs tried. Is it the wireless chip that is bad? How can I test it?
I have reinstalled the kernal module (Ath5K) several times to no avail.
Thank you for your suggestions. I hope that you now have more.
(I have a question: What is the difference between DNS Domain and, Search Domain?)