So your basically saying that somebody dials your phone number turns the pc on and then views your data? Sorry but this is complere rubbish. Granted if your pc was switched on and you where connect to your broadband account then there is a chance you can be hacked.
As an example using the fastest computers available today to hack or view your bank account details that uses 128 bit encryption would take 20,000 years and the equipment would cost well over $400,000,000, So I think the "mate" that knows all about these puters aint a hope.
Check this link for more info on secure sites
http://www.mycrypto.net/encryption/e...ion_crack.html
The only chance would be if you saved your login details and password in a word processed file and they downloaded this, which is as stupid as writing your visa pin number on the card itself.