Peter Jennings from TechOMania 24X7 called to say that my PC had been infected and would probably crash as a result.  Wanted to sell me a one-time minimal fee (159) internet security plan to clean and protect computer.

How would they know if your computer was infected?  The answer is, they wouldn't.  Another scam call - never give a cold caller access to your computer - you'll end up not only out the money you pay to get a bricks and mortar computer tech to fix the computer, but also have any personal info on the computer stolen.  Microsoft has more information on this scam:

http://www.microsoft.com/security/online-privacy/avoid-phone-scams.aspx

Got a call from this phone number,wanted me to get on the computer to "fix" my problem. After trying to understand the call,got their phone number. This guy had a definite accent and was hard to understand. Finally hung up,not accessing the computer for him and looked this number on my iPad. Is this a scam?

Yes, it is a scam.

The caller tells you they will disinfect your computer at a very reasonable price. After (or, sometimes, before) you send the money, they tell you to click on some buttons and links, so they can disinfect your computer. However, if you do that, you give the scammer full access to your computer, and they will do nasty things, such as steal your card or bank data (if you had it on your computer), steal your contact list, and send friends phony emails. Needless to say, if you sent money, it is gone. If you gave THEM your card number, consider contacting your card issuer!

Received a call from (949) 478-0968 regarding my "Windows'based" computer.  They stated I was a registered user and there were problems with my computer to include virus-related issues, software issues and printer problems.  I asked them how they got my information and phone number as I am on a do not call list.  I asked for their number and they gave me the above-referenced number.  I would not divulge any information or give them access to my computer.  Subsequently, I called them back for additional information as to where they were located and they stated "Newport Beach, CA."  I asked for the company name and they stated "TECH MAESTRO."  When I told them I was not the owner of the computer (and named a state law enforcement agency) they hung up on me.  I called back and stated I was disconnected and asked them for their CA business license and they stated they were a "Global Service and Support Company for Windows."  I then asked for their Federal Tax ID # so I could provide it to my company for verification before I could grant them access to the computer and also asked for their business address at which time they became very belligerent and stated they do not provide their personal information.  BE VERY WARY OF THIS SCAM!!!!!!  If the company will not share their information, please do not share yours.