I have a similar query
I've been running Windows 7 for a couple of weeks now after upgrading from Vista and it have been going well
However, earlier this evening I shut down my laptop and when I restarted it my network notification image changed. Previously it had been like the first image here (an animated gradient which indicated the level of wireless connection). Now it just has the image which seems to be dotted around this site of a monitor with a cable next to it, like the second image here. The weird thing also is that it has a cross next to it when I am connected to the wireless network.
Is this a common problem? I don't know why it changed or how to change it back or even how to make it tell me that it is connected, or it has detected networks.
I hope someone can offer some help.
Ian