It is reported that nowadays a majority of scam cases are related to tech support incidents. If a guy calls you, introduces himself from Microsoft or some other well-known firms and if he tries to create a sense of urgency it could most probably be a scammer. But with some amount of caution we can keep ourselves safe : Never give control of your PC to a third party. We can’t even trust caller IDs as they know how to spoof caller ID numbers. A strict NO to credit card and other sensitive details over phone. Never trust a person who tries to sell anti-virus software programs over phone with great offers. He is trying to infect your PC with malicious software. The best strategy would be to recheck the case by directly dialing the company.