A scam known as AMMYY phone call - scam on the WWW.
An indian caller claiming to be from The Windows OS support (NOT MICROSOFT LOL), guiding their victims to check exisiting messages in windows OS discribing them as viruses and against Australian laws. They constantly advise they are calling from Melbourne gave some address 66 Albert Rd. VIC 3141. and provided 03 9016 0638 which I used to call them back was obvious that the number routes to VOIP service. A quick AMMYY search in Google will return alots on blogs reported scammers from the same VIC number.
Regards.