[ubuntu] AdHoc connection with XP

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http://ubuntuforums.org – Hello guys, am totally new to the world of Linux, and Ubuntu to be more specific. My problem goes thus; I am using a Huawei USB modem on Ubuntu 11.10 i just installed. i created a new wireless connection with the name "UbuntuAdhoc", which i followed from another thread. I then tried sharing the internet connection running on Ubuntu with XP using WLAN. The laptop running with xp does detect the connection i created, connects to it, but can't connect to the internet. I es wondering what i could do to get this running. While on the topic, how do we share folders with xp? Thanks in ad (Hardware)