"PC Support Squad"   SCAM!!!!!  Be aware:  This is an attempt to access your computer and everything on it!!!  
"Peter" with a very thick Middle Eastern accent claimed to be warning me that my computer had been hacked and he worked for Windows Security and he was calling to "help" me and "clean-up" my computer.  Clean-out my financials is more likely,  I kept him on the phone for awhile by playing dumb and worried.....
He asked me to get on-line so that he could access my system to upgrade the security and "get rid of the bad things".  HAH!!!!!  One of the clues as to the illegitimacy of this caller was when "Peter" gave me his phone number (after I asked for it) was how he spoke it:   7865-9-205-86 - that is NOT how US phone numbers are spoken.  I finally confronted Peter with all of the inconsistencies in his claims and that I would be reporting him to the proper authorities. He became very upset, called me a few names and threatened to disable my computer.  
What is scary is just last weekend my computer developed some problems so I called my (very reputable and good) computer guru.  He had my computer and found that someone had "hijacked" my ip address and other info and was running a Proxy Server from my server.  Scary stuff!!  He is now cleaning up my system, installing a more powerful virus/malware protection and security program.  DO NOT RESPOND TO THESE PEOPLE - THEY WILL COST YOU THOUSANDS!!!!!!!!!!!