Open OneCare, click on change settings and disable to OneCare firewall temporarily. Does doing this allow your wireless connection to work?
What is your OS, what is the make and model of the router, and can the wireless conection make a connection when plugged in with an ethernet cable?
You may want to contact OneCare support -
How to reach support (FAQ) - http://forums.microsoft.com/WindowsOneCare/ShowPost.aspx?PostID=2421771&SiteID=2
-steve