Macbook pro "breaks" wireless network

greetings,
whenever i'm home, i use my macbook pro to connect to our wireless network, a network that is usually only used by PCs (one running Network Magic).
However, whenever i connect, it works great but sporadically it will "break" the network, causing the router to be reset. when it's down, it doesn't work for any computer. but this only happens when my computer is connected. also, this is the second router, so it shouldn't be that.
is this caused by my wireless card or os?
Message was edited by: mfeury

I've been experiencing a very similar issue.
I have a MBP from Nov 2007. I have a Billion 7402GL wireless/modem-router.
I have a 3 year old Acer Aspire 5672 that I am using as nothing more than a Windows Media Center gateway. In other words the Acer's wireless connects to my main desktop in the next room, where all my TV shows are stored and shared out to it. It is then connected to the AV inputs on my TV.
For the last month or so, if I am streaming something through to the Acer, if I then power up my MBP (where the WLAN is set to immediately connect) it appears that the MBP immediately consumes up all the signal/bandwidth to the wireless router, because the playback on the Acer either stutters, or freezes, which then crashes MCE.
However once I disable WLAN on the MBP, the issue goes away.
The strange thing is I have not altered the modem's firmware, nor any drivers on the Acer. I'd be willing to blame it on a Windows Update for Vista, but that wouldn't explain why I only suffer issues when the MBP's WLAN is operational.

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