I was fixing a friends PC yesterday. More specificlly his network was having problems. Anyway, while i was waiting for his PC to boot, i frired up my laptop.

Upon doing so i noticed i gained access to his wireless network without any authentication at all! I advised him of this, but he shrugged it off. He said, "there's nobody around here that would hack in".

OK! I was wondering.

What could someone do if they got onto an unsecured network like his? Could you see his PC contents? What bad things could be done?

I am a bit worried because he keeps alot of financial info on his PC.

Thanks.

Note: He doesn't have anything shared. Both his home PCs are using XP Pro.