Can see wireless network but can't connect

[jo15765]

My Vista Ultimate desktop can see my wireless network, but for whatever reason it is unable to connect to it. I tried system restore, and disabled windows firewall all to no avail. The only change that has been made since it worked to now it's not working is that I connected it to WIn7 homegroup (but it worked fine for 2 - 3 days being connected). Why won't it connect now?

 

[mickey megabyte]

has your network got a password?

try connecting with it turned off temporarily.