Home Network on Linux-Unable to Connect

I am having problems with my new Aspire One which I purchased with Linux. The WiFi works great at coffee shops, airports and places outside the home. But we've tried accessing the home network and it won't connect, even though we have other laptops connecting in the house (using Windows XP). We've also tried using the hard wired cable connection, and that won't work on the Acer with Linux either. I assume this is a Linux software problem, not hardware given it works ok without any problems in areas that aren't encrypted, like the home network.

Anyone else had similar problem and if so...what did you do to fix? Could use any help!

Thanks
Len