I've recently put together a system with the a8n-e,
After a rather difficult time getting my isp to switch over the mac address so that the internet works on the new computer and getting windows installed and upgrading to service pack 2, I set a restore point and install the latest nforce 4 amd drivers from nvidia's site. After the reboot, suddenly my internet is no longer working. I figure maybe another mac address issue, but calling up my isp has them telling me they show me as connected. Sure enough, if I open the command prompt and ping various sites, I get a normal response. When I open outlook and try connecting to the isp's pop mail server, it correctly prompts me for a login and password. Hrm. Opening internet explorer just has it tell me it cannot open the site. Also if I try to change the address in the bar and hit enter, it tells me it "cannot find the search page".
On my current motherboard (msi k8n neo 2 platinum) I recall trying to update my nforce 2 drivers and running into a similar problem, suddenly I wasn't able to connect, and only a system restore fixed it. Interestingly, in this latest case a system restore was not able to fix the problem. I guess I'm just wondering if anyone has any idea what's going on, has had this happen to them before, or has any suggestions on what to do. Was debating if maybe it's just a problem with the onboard lan, and if buying an ethernet card would help resolve the issue finally. Thanks in advance for taking the time to help!