Somtimes the solution status keeps as deploying, seems that it is stucked to solve that we can do the following:
Run stsadm -o execadmsvcjobs on all the servers in the farm
Restart the timer service.
A new version of Service pack 2 is ready to be downloaded after solving the issue of expiration
http://blogs.msdn.com/sharepoint/archive/2009/06/25/service-pack-2-update.aspx
Changing the passwords from time to time is a healthy thing to do.
Here you are a nice link to do that in SharePoint accounts.
http://support.microsoft.com/kb/934838