My ISP

Sapo (or Sapo.pt) is my ISP for some time (more than one year).

It started with an ADSL connection at 512Kb/s. It all worked alright during that period. Meanwhile, they upgraded connections, and I got a 2Mb/s connection without changing the contract. During the first weeks it worked alright (sometimes with doenloads higher than the 2Mb/s) but that ended. Now, my Internet connection is slow and shaky. Almost everyday I get an IP change. Today, that happened three times during 5 minutes.

Of course I contacted the support guys. First answer: you have trojans or worms. Try to install an anti-virus. In any case, download Messenger (a MSN from sapo, basically) and contact the online support.
My answer was: I'm using MacOS/X. I don't have trojans, I don't have worms, and I can't install the Messenger because there isn't MacOS version for it.

Their answer? They say I have trojans or worms... I wonder if they know what MacOS is.