I had a situation when my computer with Win7 RC EN, 64 bit went into sleep mode (just a long idle time) and after it woke up it couldn't reconnect to the internet (tried to use the troubleshoting option but it didn't helped). Moreover when I turned off the computer it took a really long time before it restarted (5 minutes or sth) and after restart it showed a message the windows hasn't shut down properly I've found that it can be fixed by turning off the option "Allow the computer to turn off this device to save power" for eth controller (Atheros AR8121/AR8113/AR8114 PCI-E Ethernet Controller (NDIS6.20)) It looks like a bug, but I don't know where to report it, so I'm posting it here regards jkarczm

Thanks for the help.I was using that nic card and switched to D-lionk DFE-530TX+PCI adapter still had the same problem.It also worked for me by turning off option "Allow the computer to turn off this device to save power"ThanksPaulsCompute