If you use different types of user accounts, such as administrator or standard accounts, your computer may be better protected if you log on using an account with limited privileges. Users with administrator accounts can make system-wide changes to the computer, including installing and removing programs, adding and deleting operating system files, and accessing other users' passwords and library databases. Users with limited privileges cannot allow programs to install and run automatically, which could protect your computer from viruses.
For more information about user accounts, see Windows Help.