Notebook log on to many networks

I have to log on to different networks, some domains some workgroups. I always have to change the settings, and go through a re-boot, not to mention I hate having to sift trough all my profiles to find documents! (yes when I am in a rush, I accept default my docs settings)

Also, sometimes when I try to join a domain, it says no domain controller found, when in fact its there, I log on with a the system right beside mine as a test. I am assuming, something from the last network I was in, is doing this, but as it works sometimes, and sometimes not, have no idea what is causing it.

Any tips/tricks for users who havwe to login to different networks all the time, much appreciated