I found this very useful script a while back that will give a local user temporary administrator rights without having to log off. Even though it’s not possible to refresh a security token group membership for a user without log off, this script makes it possible to execute programs as the current user with administrator rights.

Essentially all the script does is:

1. Authenticate as Admin
2. Add user to Admin group
3. Starts command line process in a new session with a new token for user with admin rights
4. Removes user from Admin group

Find the script MakeMeAdmin.zip and more information here – Aaron Margosis’ WebLog : MakeMeAdmin — temporary admin for your Limited User account