"Man in the Middle"?

I contacted a tech from what i thought was Canon printers and with in one hour they had me in a panic.  The first guy used remote access and showed me ALL KINDS OF INTRUSIONS.  8414 to be exact.  I get pop ups constantly even tho my blocker is on.  It makes me crazy.  Anyway i was told that to remove this man in the middle intrusions whee someone is taking over my computer i can take it to the Microsoft store and pay $400 to $600 or they can do it thru their website for $300.  It was ridiculous arguing over such an amount but we did.  The supervisor came on and gave me "a deal" not to pass up.                             THEY SAID I HAD NO   INTERNET ACCESS PROTECTION    SO HACKERS WERE IN MY COMPUTER AND NOT LETTING ME PRINT A PAGE I NEEDED.    I am  scared because of my banking issues, i have researched this network access and really there is nothing no info.  but on my security page it says its off.    please help.   i have many many popups and advertisements i cant get rid of.