Activation is the least of your problems. You need the web for all kinds of
reasons if you're going to use any OS. Taking Colin's cue--hit the Windows
key + R and type devmgmt.msc in your run box and see if you even have an
entry for "Network Adapters" in dev manager and if your NIC card is present.
Having said that while most of the time it is, having the entry present
doesn't always guarantee that the driver is healthy but given your problem
Beta 2 might well have set up leaving your NIC card driver behind. I've
seen that happen I think in 5381--and this might be different for diffrent
NIC card drivers.
If you don't see it, and you're on a dual boot, you can get the driver with
your XP boot and just install it from Vista adding new hardware. There is
also the possibility it got corrupted somehow during install but more likely
that it isn't installed if that's the problem.
In addition, if you do have a healthy NIC card driver, then when you try to
load a web page what do you see? Check eventvwr.msc in the run box as well
and see if you have any info there.
Have you tried to ping a couple web sites at the cmd prompt? Go to
run>cmd>try typing in
ping
www.msn.com -t
and let it ping 15-20times and then stop the ping with a Ctrl+C.
Do the packets transmit or time out?
CH