I going to answer my own questions, but thanks for all the replies and suggestions. But I thought I would put the answers just for FYI
SteamGuard started in March 2011.
And according to the Steam website this is how you enable it.
(From Steam Web site)
What is Steam Guard and how does it impact me?
Steam Guard is an additional level of security that can be applied to your Steam account. The first level of security on your account is your login credentials: your Steam account name and password. With Steam Guard, a second level of security is applied to your account, making it harder for your Steam account to fall into the wrong hands.
When Steam Guard is enabled on your account, anyone attempting to login to your Steam account from an unrecognized computer must provide additional authorization. A special access code will be sent to your contact email address, and this code must be entered into Steam before your login is complete.
Once you've verified your email address with Steam, Steam Guard becomes available for your use. Once enabled, you will be required to access your email and provide the special access code from Steam Support when logging into Steam from any computer which we don't recognize.
And according to the last paragraph, to enable SteamGuard I need to verify my email address.
How does this affect my account? If SteamGuard started in March 2011 and my account has a Verizon.net email address (of which I stated no longer exist because of Frontier.com taking over in my area), then the information below from Verizon is interesting.
(From Verizon web site)
ATTENTION CUSTOMERS LOCATED IN THE FOLLOWING AREAS:
AZ, ID, IL, IN, MI, NV, NC (except Knotts Island), OH, OR, SC, WA, WI, and the following communities in California that border AZ, NV and OR: Big River, Blythe, Coleville, Crescent City, Desert Center, Eagle Mountain, Earp, Felicity, Fort Dick, Gasquet, Klamath, Kneeland, Markleeville, Merced, Needles, Orick, Parker Dam, Ripley, Smith River, Topaz, Trinidad, Vidal and Winterhaven.
As of July 1, your Internet, Telephone and/or Television service was transitioned to Frontier Communications. You will no longer be able to access your account information at
www.verizon.com. You can visit Frontier's portal at the following new web address:
www.ncnetwork.net to access your Verizon.net email as well as information about your local and long distance voice, internet and/or TV service account information. Please note, the pages on this Frontier portal will be gradually changing from Verizon to Frontier so you will see the Verizon logo on this site until all of the pages have been changed to Frontier.
To access Verizon.net webmail, please visit
http://webmail-pn.ncnetwork.net until Frontier notifies you that your email has been moved to Frontier email. Frontier will provide you advance notice before your email is moved during the months of July - September; Verizon will continue to forward email sent to your Verizon.net address until December 31, 2010.
Noting the date of Dec 2010. It would be impossible for me to enable SteamGuard. Was my account hijacked? I doubt it because it was fine till I built a new computer a little over a week ago. That email address does not even exist today either.