I find this interesting as over the weekend I found myself unable to access the internet. I use Windows 7 and saturday night I installed a very large number of critical updates when I switched off. Earlier I had noticed a window had appeared which stated your password has been changed, which I hadn't. I clicked cancel on this window and just to be certain did a restart, everything seemed OK. Sunday no net, tried a system restore to the last point before the update, it just hung. After 20 minutes I switched off the machine. Switched on again, and managed to do a restore in safe mode successfully. So far no further problems, but this post makes me wonder if the problem was specific to Windows 7.