Back in August I built a new machine using all "Windows 7 approved" hardware. The NIC worked fine up until a 2 weeks ago when the computer began getting a BSOD upon boot. I noticed when booting that it would only Blue screen when booting to an option that included network support (so even Safe mode with network caused a BSOD). I tried reading the dumps but it gave a different file every time as the casue. I uninstalled my antivirus (symantec endpoint 11) as it was updating when the failure occurred and was reporting the definitions were corrupted. after reinstalling SEP the BSOD stopped. I attempted to update my antivirus again and half way through the process it failed. I then noticed that I could never fully update my mail either and downloading more than 1 file at a time in either IE or Firefox would casue all downloads to stop after a second or two. I then did a wireshark trace and found an error that each time it fails I get the error "TCP window Full" as well as "Zero Window". I connected the same cable to my laptop (running XP) and tried the same download and it's trace does not get this failure. I also connected my desktop directly to my cable modem, bypassing my router... same problem. Task manager shows almost no network utilization when this happens. I took screens shots of task manager's usage with my mail download. These images were taken at 14 minutes apart and NO progress is being made even though I have 16000kbps downloading and 320kbps uploading speed on my broadband. I have also updated to the latest driver on the ASUS web site for the NIC and this still occurs. I even installed a new PCI-E NIC by a different NIC vendor and it too fails. The only thing these failures have in common is windows 7. I have tried all of the following based on other threads I have found: Update Router FW Update Bios Update Nic Driver Test with no Antivirus Disable ipv6 Ran the following command in an elevated command prompt in Windows 7: netsh interface tcp set global rss=disabled netsh interface tcp set global autotuninglevel=disabled netsh int ip set global taskoffload=disabled Disabled SNP in Windows 7 by setting Registry as following: [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters] EnableTCPChimney=dword:00000000 EnableTCPA=dword:00000000 EnableRSS=dword:00000000 Set Receive side scaling to DISABLED. Anyone have any ideas? I really do not want to have to return to XP for my network to work. It make no since that this went from working fine to not working so quickly.