Details below are quoted from Jeffrey Altman at http://openafs.org:.
"There is a serious incompatibility between Microsoft Windows XP SP2 and all previous versions of AFS for Windows whether released by IBM/Transarc or OpenAFS.org. The afslogon.dll which provides the Integrated Logon functionality violates newly imposed security restrictions. These restrictions cause network operations performed during DLL process attachment to block forever. This will prevent proper loading and unloading of user profile information. Depending on the version of AFS, the boot cycle of Windows XP SP2 may fail to complete.
All users are strongly encouraged to upgrade to the 1.3.70 release prior to the installation of Windows XP SP2. If OpenAFS for Windows cannot be installed, all references to afslogon.dll should be removed from the system. If present the following registry key should be deleted
In addition, the string "TransarcAFSDaemon" must be removed from the "Provider Order" value in the following keys:
HKLM\SYSTEM\CurrentControlSet\Control\NetworkProvider\Order HKLM\SYSTEM\CurrentControlSet \Control\NetworkProvider\HwOrder
Doing so will avoid the incompatibility and will disable the integrated logon functionality.