Virus after Skype download

hi i downloaded skype and everyhting was fine, until i got a call form the support service saying i have a virus on my computer, but i just got this laptop im using, and it has Microsoft security essentials virus protection.

i scanned my computer and there was no viruses detected.
WHAT SHOULD I DO? SHOULD I BE CONCERNED OF A TROJAN VIRUS?

 

I've never known any support service to call.

You usually have to initiate contact with support whether it is software, hardware, computer system or ISP.

 

Norton Alert of Virus after Skype download

My Norton Security software has been recording Intrusions and authorized access blocks ever since I received a Skype “update” call on or around March 19th. It said my system was infected and that I should download something (can’t remember what type of file) to “clean” my laptop. I chose to simply close the call without doing anything, but that didn’t stop my laptop from being infected (I suspect). Please, please check your virus software for updates, and make sure your firewall is on (mine wasn’t for some reason). Skype NEVER initiates calls to users concerning suspected virus infection! These intrusions are still occurring and so far as I can tell my Norton software is handling them (though I’m still not satisfied that my laptop has not been affected). I've run my own virus scans with Norton and Malwarebytes in safemode,but I'm also going to follow the steps in the READ ME to make sure.