Superior Tech Help.Com Computer on-line repair scam , Internet

My experience is very similar to the 2 previous reports on SuperiorTechHelp.  For several weeks, I was annoyed by a popup telling me I must install AdobeFlash.  I would click it off, and it would immediately reappear.  I already had AdobeFlash installed.  So I uninstalled and then reinstalled it.  The popup continued. On January 2, 2013, I found There was a small icon for "Help", which I clicked on and got an Indian voice telling me he was a Microsoft technician and would remove the offending popup.  With my permission, he gained control of my computer and "removed" the popup. He then claimed my computer was very, very slow (it isn't)and had many "errors" which he showed me and offered to clean the files for $249.95.  I don't know why I fell for this, my computer only cost a couple of hundred dollars.  I agreed, and left the house for a previous appointment.  When I returned, there was a phone message, urging me to contact.  I then "signed" a contract.  It was not my actual signature, but I did agree, after which he called his "supervisor" another Indian who---just as in the previous report--spoke very softly, with heavy accent, against a background of call-center noise so that I could not hear.  They wanted me to agree that my computer had been fixed.  I refused, saying I could not tell until I used the computer.  They hung up, and immediately, I called my credit card company (Bank of America) and cancelled the card, and reported a fraud.  They held off posting the charge, and opened an investigation.  To support my claim, I Googled the firm's name and came up with your two reports, so similar to mine, except that they claimed to be Microsoft.  Meanwhile, I received a postcard in the mail which gave the Glendale,CA address and phone numberThe postmark, however, is Tampa. dated 10 January 2013.