Tech4808

I'm having some major issues with Vista 64 and internet connection problems.

Everything will work fine, then all of a sudden I cannot connect to the
internet. Comes up saying that the DNS is not found, and to contact my ISP.
I am using a speedstream 6520 router/modem, and I can connect to the modem
fine, it says I'm connected to the internet, yet I cannot sign into
messenger, or view any webpages.

I can mess around for an hour trying to get it to work, then all of a
sudden, I am able to connect again. My ISP has checked the lines and
everything is good. I've never had an internet connection problem with XP.

Any suggestions? I have all my drivers up to date, and have very new and
trusted hardware installed.

Specs:

DFI Lanparty UT nforce 4 board (newest drivers installed)
8800 GTS
Opteron 165
Speedstream 6520 modem/router (Bell sympatico)
Vista Home Premium 64 bit