Atheros Communications, Inc.
•
xxv
February 2011
Uninstall an Old Driver
Uninstall an old driver before upgrading to a new NDIS driver release.
To remove the newly installed driver from the system if the system does not have
previously installed versions of the NDIS driver, proceed to Step 4.
1.
To remove the NDIS driver from the OS, go to Device Manager, right-click
Atheros
AR500x Wireless Network Adapter
, and choose
Uninstall
.
2.
Click
OK
to uninstall the device.
3.
When the device is uninstalled from Device Manager, search for and delete the
driver files that reside in the system.
a.
Go to the Start menu and choose Search > For Files or Folders.
b.
Enter
oem*.inf
in the Search for files or folders named: field, and enter
Atheros
in the
Containing text:
field.
c.
Click
Search Now
. A few files matching these criteria are possible, if previous
drivers have not been removed properly.
d.
Choose the files that have been found and delete them from the system.
4.
To complete the uninstallation, remove the file
ar5211.sys
from the folder
\WINNT\system32\drivers
.
Additional Security Features
These security features prevent attacks on a wireless network's WEP keys. The wireless
adapter automatically supports each of these features, but these features must be enabled
on the access point.
Message Integrity Check (MIC)
MIC prevents bit-flip attacks on encrypted packets. In a bit-flip attack, someone
intercepts an encrypted message retransmits it after some alterations. Thus the receiver
accepts the message as legitimate. The MIC adds some bytes to each packet to protect it
against tampering.
Temporal
Key Integrity Protocol (TKIP)
This feature prevents attacks on WEP in which someone catches encrypted packets and
uses their initialization vector (IV) to decipher the WEP key. TKIP removes the
predictability to protect both unicast and broadcast WEP keys.
Broadcast
Key Rotation
EAP authentication provides dynamic unicast WEP keys for wireless adapters, but uses
static broadcast keys. In broadcast WEP key rotation, the access point supplies a
dynamic broadcast WEP key and changes it at intervals.
