I have a persistent problem with Network failure, Windows 7 RC Build 7100. I installed with defaults, I just updated the Broadcom network driver to use the Vista 32 Bit driver from Dell, no change. The problem occurs when I start to (robo)copy large files (around 100GB of files)to the laptop, and then connect to a website with a certificate error. I have tried disabling IPv6, and the windows firewall. Each time I connect to the website with the Cert error while copying large files, it will drop the network connection, the troubleshooter will repair it saying that the default gateway is unavailable.I can access the website just fine, or copy the files just fine, but the two together drop the network.The system is a Dell Latitude D630 with 2GB RAM , a Broadcom GB NIC, and is a clean build (as of about 10 hours ago).Current BIOS, the only drivers that have been changed from Windows 7 built-in drivers are the NIC and VideoI've looked through the related issues, and the networking threads, found a couple of similiar issues,but the resolutions didn't help. I had Vista prior to rebuilding with Windows 7 and no networking problems.

There seems to be an issue with multitasking on the network. Hopefully a further release candidate will resolve this.