I received three calls from this number today.  All callers had heavy Indian accents and claimed that my computer had sent error messages indicating that it had been infected.  They told me that this virus had already infected 45% of the windows users and could crash my whole computer.  When I asked for verification of who they were, they gave me this phone number and told me they were a Windows Service Center in Baltimore, Maryland..  They also claimed to be able to tell me a CVC number on my computer to verify that they are legit.  Beware!!!!  It is a scam!!!