>> of course i know that but most true virus do not connect to the internet
Yeah dude... but the whole purpose of this thread is talking about internet and trojans and people hacking your computer. Nobody here is talking about BIOS viruses et al.
netstat will tell you if you are connected to anywhere: virus... sneaky hacker... or whatever. It is just one tool of many that you can use to diagnose strange occurences etc.
Witch_King... instead of shutting down your computer at night as suggested... try this if you have win98 or later.
run winipcfg in the start/run box
click on more info... that gives you a lot of info on your addressing, subnets etc.
Click Release all... voila.... you are no longer connected.
When you wake up in the morning... click renew all and happy surfing.
Don't only rely on ZAs internet lock if you think something suspicious is happening.