Connection drops.

I have Vista Home Premium Boot Camped and whenever I switch over to Vista, my internet connection usually drops after 15 minutes. I have to reset the modem and then it works fine after that.

I think this is a Vista problem because my connection never drops when I'm using OS X. Any ideas what might be causing this?

I use Vista on my computer I am on right now. And it sometimes stops working for me. It says it is still connected, but yet "This page cannot be displayed" always happens. Lasts for about 5-10 minutes for me. Hasn't happened yesterday or today, but two days ago it happened 4 times in 3 hours. It really depends... I think it is a Vista problem though. That's all Vista is.