I installed the optional Atheros WiFi chipset update provided by Microsoft for Windows 7 Beta on my Asus Eee PC 1000HA netbook this morning. Unfortunately, after the installation and reboot, I was able to see but NOT connect to my wireless network. So, I used Windows 7’s System Restore to get me back to the pre-update state and was able to get online.

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Microsoft driver update for Atheros AR5007EG Wireless Network Adapter
Download size: 1.3 MB

You may need to restart your computer for this update to take effect.
Update type: Optional

This driver was provided by Microsoft for support of Atheros AR5007EG Wireless Network Adapter

More information:
http://winqual.microsoft.com/support/?driverid=3846

Help and Support:
http://support.microsoft.com/select/?target=hub