I just received an identical call from this same phone number. They were "certified" by Microsoft and wanted to help clean up my computer. For $363, they would install Microsoft Security Essential and PC Matic. MES is a free program and PC Matic is not endorsed by Microsoft.
Be very cautious!

This scam has been going on forever.  They won't install any useful programs on your computer - they will install spyware and steal any credit card numbers, account names and passwords, and contacts on your computer.  Probably the only safe use for your computer after they have had their way with it is as a paperweight.

I just got the same phone call and he's waiting for my phone call back. Glad I found this site first!

My husband received the call and let them into the system. I traced the phone call, but was not able to find the name of the owner. The call originated in New York.

Hello all,
I got the same call and the same hefty price (for life yet!)
I first got a fellow named Will and then was transferred to Jack, a person with "excellent" technical skills." Both had strong accent. Both had strong accents. I asked Jack to show me their website and he (using TeamViewer, brought up a well done/excellent website. Jack insisted that he show it all to me, but he wouldn't give me the full name, and I thought the IRed name at the top -- quite big --- could be googled. I couldn't find it, and it didn't show up in my "history" of websites  Jack was quite excited talking about his firm's close ties with Microsoft and pictures of the staff, all trained by Microsoft. He wanted a quick decision and I told him I didn't work that way and suddenly the details of his offer were erased from my screen. He did leave his call-back number and Will's name and that's what led me to this page, Jack typed the following on my screen and I saved it. Happy to share:  

347-305-0007
WILL

Glad I didn't sign on, although the list of 4,200 error notices that he showed me was daunting.