I have just been telephoned by a poorly spoken Asian claiming to be from "Windows". He claimed that I am supposed to be having trouble with my computer which is apparently not working properly and displaying error messages. In order to fix this I need to do what he says.
When I asked for his contact telephone number or his email address, "he wasn't allowed to tell me".
I told him I didn't believe he was who he claimed to be and hung up.
"Windows" doesn't exist as a company,it is a trademark he would have been working for Microsoft.
Be warned!
I didn't think quickly enough at the time , but I should have kept him talking while someone else in the house rang the Police to get the number traced.

.guardian.co.uk/technology/blog/2011/mar/01/microsoft-virus-scam-continues

I've had the same thing Roy (twice), except it was a lady. Like you I realised it must be a scam as Windows isn't a company but I'm afraid all I did was say "RUBBISH!" and put the phone down. Of course 1471 revealed that the caller had "withheld their number"...

My bus number (if any): RML2302

Wait till the Nigerian phones up and says you'll get $7m from his great aunt who recently died and you're a beneficiary...

My bus number (if any): RML2532 Keeping Europe's Routemasters on the road.

Hoho - yep, that's a cracker too Roy

My bus number (if any): RML2302