1: Rebooting before calling for help
Although telling users to reboot when they experience a problem may seem like a cop out or delaying tactic, it's an uncomfortable fact that rebooting apparently fixes a multitude of both real and perceived errors. Even if a reboot does not solve the problem, the mere fact that the problem recurs after a reboot can give the canny support tech significant diagnostic information. Rebooting is not a panacea for all computer ailments, and it's even contraindicated in some cases, but appropriately and correctly applied it's a useful and simple tool with which to arm your users.
2: Reporting a computer problem
In addition to knowing the correct procedure for reporting computer problems - -e.g., e-mailing the help desk — users need to know what information will help expedite the resolution process. They can easily be trained to effectively report problems if they're provided with a form that gathers the appropriate information, such as any error messages, open applications, what were they doing when the problem occurred, and whether they can reproduce the problem. Consistently asking users these questions will also serve as training and will help prevent them from either giving too little information or from offering their diagnosis of the problem instead of the symptoms.
3: Keeping passwords safe
There is little point in having a password if it's written down in an unsecured location or shared among co-workers. I have seen passwords written on post-it notes attached to monitors, inscribed in permanent ink on the side of computer cases, written on the backs of hands, pinned to notice boards, and even displayed as the text of the Marquee screensaver. Instructing users not to write down or share passwords has little impact, however, if they don't understand why that's risky or if the password policy is unnecessarily onerous for the environment. On the other hand, an intelligently conceived password policy, suited to the current security needs and well communicated to users, will definitely cut down on the incidence of password carelessness.Hope this helps!