Someone calling himself Alex Bowen saying our computer is at risk

Someone calling himself Gary #1046 said he was calling from Windows Service center.  While I wasn't online he had me check computer management under my windows operationing system which showed a lot of errors.  He then tried to get me to download teamviewer.com so that he could share my screen to fix the problems.  Said it would speed up my computer which really is running slow.  I couldn't understand him very well due to his thick accent.  I felt like it might be a scam so I hung up.

SCAM bigtime!  Those errors you saw are harmless and do not indicate a virus, malware or that your computer was going to crash.  Had you let him onto your computer, he would probably have caused it to malfunction to extort money from you to "fix" it. He would likely have installed malicious software that would send your logins, passwords, credit card numbers, bank info etc to him whenever your were online.  Microsoft has warnings about this scam on their website:

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

Same thing happened to me today- a guy called from "unavailable unknown" number said he was calling from Windows and kept being very pushy for me to go onto my computer because he said I had a "malicious virus".  I could hardly understand him as well and could tell he was calling from somewhere far away because when I answered it took awhile for him to say anything.  He said there have been downloads on my computer I don' t know about causing this malicious virus and that's why my computer is very slow.  Thinking this could possibly be a scam because he seemed very pushy I asked for the phone number to call him back.  He gave me this one.  I asked for a 1-800 number- since he is apparently calling from a major company there should be a 1-800 number.  He then said "I'm sorry I can't help you" LOL be careful!!

I sory for my english but i'm a french guys from Québec. I'ad a call yesterday from Harry from Windows services and he tell me that I have some malicious virus on my computer and he will help me....After took  me 200$ for 3 years of services and he do some things on my computer and oder guys call me back to check if everything is good but all my cmputer is very slow now....

Did some on  could help me i think this is some vay to stold me money...?