You cannot connect to a wireless access point with the Wi-Fi Protected Access update installed (821442)

SYMPTOMS

After you install the Wi-Fi Protected Access (WPA) update (815485) on a Windows XP-based computer, your wireless network adapter may not be able to connect to your wireless access point by using a Wired Equivalent Privacy (WEP) key. When this problem occurs, the wireless network connection status indicates "Wireless Connection cannot be used."

For additional information about the WPA update, click the following article number to view the article in the Microsoft Knowledge Base:

815485 Overview of the WPA wireless security update in Windows XP

CAUSE

This problem may occur if your computer uses an Intel PRO/Wireless 2100 LAN MiniPCI network adapter with version 1.1.6.0 (or earlier) drivers for wireless access.

RESOLUTION

To resolve this problem, update the drivers for your wireless network adapter to version 1.2.0.56 or later. For additional information about updated network adapter drivers, visit the following Intel Technical Support Web site:

http://support.intel.com/support/wireless/wlan/pro2100/index.htm

Microsoft provides third-party contact information to help you find technical support. This contact information may change without notice. Microsoft does not guarantee the accuracy of this third-party contact information.

WORKAROUND

To work around this problem, remove the WPA update:

Click Start, click Control Panel, and then double-click Add or Remove Programs.
Click Windows XP Hotfix (SP2) Q815485, and then click Remove.
You may receive an error message that states that some programs on the computer may not work correctly if the update is removed. Click Yes to remove the update.
Restart your computer.