Wireless Capability Gets Randomly Disabled

some of you might recognize me from the windows 7 forums, this is my first post here. I have never used vista except to help my friends so I am not very familiar with it, but it's very close to the windows 7 interface so it's not that hard to learn. My friend has Vista and has a problem with her wireless. she has a lenovo R61i Laptop. the router is linksys WRT54GC. randomly the wireless capability gets disabled even though the physical switch is not changed ( is always on ), this happens usually when the PC is restarted or when the router is restarted. sometimes we restart the PC or the router but it doesn't occur, so I cannot re-create the problem easily.

I googled a bit and saw some people suggesting this could be because the wireless service is not set to automatic, so I checked services and the only service that seems to have to do with the wireless is the WLAN service, and it is set to automatic and started. all we have to do is just do diagnose and vista will say that the solution to the problem is found , which is to enable the wireless capability, so I click on that and it will enable wireless and everything will work. but for my friend is it confusing as she thinks there is a problem with her internet connection or her router, I told her it is a simple bug with vista ( I think ) and I will look for a solution.

So What else can I check? we had limited time today but tomorerow I will try more things, maybe I will try an update for the wireless driver. btw it is an intel built-in wirless. I thought I would ask if any of you have run into an issue like this and what did you do to reslove it. sounds to me like a bug with vista as I said but not really sure...Windows Update is turned on, so I asume the latest updates for vista are installed but i did not check if SP1 is installed or not.