|This is the last time your account was accessed.|
Vista issue. Period.
That really help no one. Thats not a just a vista issue, it can be other things, thats just a vista error.
As for the issue. Are you able to get a internal IP address like 192.168.1.10, or do you get one that is 169.xxx.xxx.xxx? Are you able to see and interact with other PCs on your network?
Have a look at the Microsoft repair article KB947041 ( http://support.microsoft.com/kb/947041 ), this is apparently a well known issue for which Microsoft says "Microsoft has confirmed that this is a problem in the Microsoft products...". It apparently happens when more than one network adapter is present on a Vista based PC.