NETLOGON service and Windows XP

We experience problems with Windows XP Pro PC’s where by the Netlogon service starts before other networking services have fully started. This appears to be related to PC’s with SafeNet VPN Client installed.

The problem only occurs if users logon as soon as the Logon screen appears, where by the following event is created:

Event ID: 5719 Source: Netlogon
There are currently no logon servers available to service the logon request

If the PC is left at login screen to allow all other services to fully start then there is no problem. The appropriate A and SRV records exist in DNS so this is definetly not the problem.

Anybody any clues, or how I can slow the startup of NETLOGON?!?