Our Windows 7 computers/laptops are very slow at logoff, around 7 minutes (no problem at log on). We don't have this issue on XP clients. Problem occurs after adding the Win7 clients on domain.

I tried to reset user profile. After resetting logoff takes around 2 minuted and after everyday it takes longer and longer

We are using roaming profiles.

Event Viewer:

Event ID: 6005 The winlogon notification subscriber is taking long time to handle the notification event (Logoff).

And then a minute later

Event ID: 6006 - The winlogon notification subscriber took 300 second(s) to handle the notification event (Logoff).