You can avoid back strain by using a fully adjustable chair that provides proper support. Push your hips as far back as you can in the chair. Do not lean forward or slouch. Make sure your upper and lower back are supported.

. Use an adjustable keyboard tray to place a keyboard at the correct height. Position the mouse at keyboard level, close to the keyboard.

You can use a wrist rest with a keyboard and mouse pad to ensure your wrists remain straight. Do not rest your hands on a wrist rest while typing or using the mouse.

Currently, passwords are required for individuals to gain access to computers and networks as well as to exchange e-mail messages and access certain Web sites. To prevent people from guessing a password, a password should be as long as possible, not appear in a dictionary, include symbols such as ?, % and #, should never be written down, should never be given to another person and should be frequently changed. Most people do not follow these guidelines and often forget their passwords. Since biometric traits cannot be forgotten or stolen, biometric technology can be more secure than passwords.

You can use a defragmentation program to place all the parts of each file in one location, which reduces the time the computer spends locating files. Some operating systems include a defragmentation program. For example, Windows includes the Disk Defragmenter program. You should defragment a hard drive at least once a month.

You can improve the performance of a computer by using a disk repair program to search b and repair errors on a hard drive. A disk repair program searches for errors in the organization the files stored on a hard drive and physically Damaged areas on the drive. Most operating systems include a You can use programs to help you move your data from your original hard drive to your new drive. For example, Windows XP includes the Files and Settings Transfer Wizard.