Usually such callers claim to be from Microsoft. This is the fake PC tech scam. See this thread:

284-643-6572) http://whocalled.us/lookup/284-643-6572
Resident47
 Aug 27th, 2012
Someone calling from this number claimed they were from Dell and that my P.C. had a virus. I didn't trust it, so I hung up.
Ordinary Joe
 Aug 23rd, 2012

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