Hi. I've had this problem in Win XP as well, and I'm posting this here cuz obviously, I'm running Win 2000 Pro SP4.
As the title says, I am having a problem with my internet connection. I'm on cable, and I'm not on a router eithter. It's just the cable modem, an Ethernet cable, and my laptop.
Here's what happens when the net goes down. These are the LEDs on it, not including power: USB, PC, TX, RX, and RDY. On a good day, the PC, RX and RDY LEDs are on and very occasionally blinking, with the TX LED blinking every now and then depending on the activity. Now, the TX LED is almost always on, then it goes off. About 20 seconds later, all the other LEDs go off, and a few more seconds later, they come back on, in this order: PC, RDY, RX/TX (BTW, USB is never on because this modem isn't hooked up via USB). On the PC, I cannot load up any webpages and I'm disconnected from any IM services I have on at that time.
Tech support dropped by my place a few times, and every time they came by, they said it was a virus that was affecting my net connection. NAV hasn't turned up anything suspicious, however.
Any clues? This is severly dropping my productivity rate and giving me lots of angst as well. :?: