My mother was called by this number. They said something about errors she's getting that are emailing them, and that she needs to update the warranty on her software or something or other. Google search says this number belongs to EComputing Services (www.ecomputingservices.com). They're trying to sell their service under the guise of telling you that you have problems.
I did, too, receive a phone call from this company, telling me that I had files infected, that my system had sent a message to their system saying so. They were asking me wich windows version I had, in order to help me identify the files infected. The thing is: I use an Apple system, so their thing was not working anymore. They didn't seem to know how to show me the problem. Also, the quality of the line was really bad, what makes me think it's a bad joke. I phoned Apple after and checked my computer with them: nothing's wrong. So I think this is all a bad joke...