Toshiba Satellite - Wireless Internet Not Connecting

I am using a toshiba satellite and have accessed the router through another computer and was able to access the internet. I am currently using the ipad to post.At first when i choose my internet connection, it will automativally try and detect the network type, then tell me that "windows is unable to connect to the selected network". I have read other user posts and went to the wireless properties and changed the network authentication to shared and unclicked the "key index". Now, when i click on my wireless network it will automatically ask me to enter my network key. But after i do that, all it does is wait a few seconds and close that dialog box without connecting me.[code]