Really slow wifi since 10.6.6

For the past few days, my wifi has been so slow on my MacBook Pro.. think it coincides with 10.6.6. I am only able to download at 40Kb/sec, and I'm on a 10MB network. Can't load youtube videos without buffering or anything.
I currently booted up in Windows 7, and everything seems fine, speed wise. Also, my iPhone 4 runs youtube videos fine on wifi.
Any ideas?

Hi and welcome...
Try a different Airport channel.
Open AirPort Utility (Applications/Utilities)
Select the device you’re setting up on the left and then click Manual Setup. Enter the base station password if necessary.
Click AirPort in the toolbar, and then click Wireless.
Choose a new channel from the Channel pop-up menu.
If that doesn't help, go to /Library/Preferences. Move all the files in the System Configuration folder to the Trash, restart your Mac.
Carolyn

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