My dell latitude laptop works perfectly everywhere but in my home... I recently had comcast high speed internet installed. I can access the internet through cable... but my wirelss connections shows little or no connectivity and when I try to effect a repair it fails because it can't "renew my ip address" Please Help

Do you have a wireless router at home? Have you check that its configured properly, with security etc.

Also what's the setup - i.e. Where in the house is your wireless router/access point and where are you using the laptop. Wireless connections don't tend to work terribly well though lots of walls etc.