Just an update for any that may not of heard of the scam.
The unavailable/out of area telephone calls with regard to "This is Microsoft .... your PC is infected" scam is still ongoing. I have had at least 5 calls in the last two days from them offering to fix my PC - and I'm certain it would have been fixed.
For those who need to know how to deal with them there are many suggestions in these forums. I either leave them to talk to themselves or tell them to wait whilst I fire up the PC which will take a long time!!
If you search on line you can get phone number, name and address of nearly every body including ex-directory numbers so it is just a matter of choosing a name and phoning all the ones that come up. I was quite suppressed when I put in my surname and it all came up and I am ex-directory .