wifi slow after installing along side windows

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http://askubuntu.com – i know this question has been asked a million times, but it seems everyone is having separate problems, I've read through a bunch of "slow wifi problems" but didnt want to jump into the terminal and start entering random codes So, im running Ubuntu 11.10 along windows 7, on a dell 1647 with a Netgear n600 wireless, and as you have guessed, the wifi is running at extremely slow speeds. i am extremely new at linux and ubuntu. iwconfig: lo no wireless extensions. eth0 no wireless extensions. wlan0 IEEE 802.11abgn ESSID:"HomeNetwork" Mode:Managed Frequency:2.437 GHz (HowTos)