THE STEP:
1. Decide what you would like to do. Are you going to reinstall your operating system because of problems, upgrading your current version, or are you installing an operating system on a new computer? Make sure that you have the new operating system install program. Windows and MAC require that you purchase a CD or DVD Rom(s). Ubuntu and other Linux are free and can be installed from a flash drive too.
2. Back up your data. If you are reinstalling your operating system, it is likely that you will need to wipe the disk. Back up your data before doing so, as everything on the disk will be destroyed. If you are simply upgrading, it is okay to skip this step, but it is advisable to save at least the most important files on your computer.
3. Completely wipe all information from the hard disc. This will insure that you do not carry problems over into the new install. For instructions on how to do this watch the video at http://www.youtube.com/watch?v=OfICZMMr0JM New installations of Windows and Linux offer to replace all data on your entire hard disk. So completely wiping it prior to installation is unnecessary.
4. Boot up. Turn on your computer and quickly enter the boot menu. The owner's manual for your computer or motherboard should have instructions on how to do this. It will show on the screen for a breif moment too. Select the drive that contains the setup disk (and be sure you have inserted it). Save the setting and exit.
5. Start the installation. It may take the install program a few minutes to load, this is normal. Once it has loaded, follow the onscreen instructions. If you are installing a new operating system on a new computer or reinstalling due to a problem, wipe the disk. Be sure you have saved everything that you would like to save before starting this process.
6. Sit back and relax. The installer may ask you for some information while it's installing, but for the most part, just waiting is okay. Near the end of the installation, the installer will ask you for last-minute information, like your name, the name of the computer, sign in name, password, time zone, etc. Do not be alarmed by this, none of this information can be used to identify you, it's all for personal preference.
7. Enter the product ID. If you are installing a consumer operating system like Windows, it will probably require you to enter a product ID. Look at the back of the CD case for the product ID. If you are installing Linux, this does not apply to you.
8. Reboot. Once you reboot, the computer will finalize everything and log you in. At this point, you may need to install drivers. Insert any disks that came with your computer or it's parts that are NOT an operating system, and allow the drivers to be installed (if necessary).
9. Allow updates. This is especially important in Windows. Allow the computer to seek updates and install them. Look for a "top 10 things to do" list for that operating system.
10. Install antivirus software. If you are using Windows without antivirus software while on the web, you are extremely vulnerable to all kinds of malicious programs. Before you do anything, even installing Firefox, install antivirus. If you don't have any, look for avast! Antivirus, it's free.
11. Use it! You're done, now what you do is totally up to you. Set a password, install programs, customize, create user accounts, etc. If you have any files you backed up, you may restore them now. Or, just enjoy the clean slate and redo everything, whatever you like.
FOR TIPS:
1. Some operating systems, specifically Linux, have expert setups and automatic setups. If you don't know about disk partitioning, use the automatic setup. It will partition the disks for you.
2. A good way to make setup faster is when you back up data, don't copy it, but move it, then defragment the disk. Try to do this the night before you install the new operating system, as the install will be able to format the disk much faster. This is especially true if you have an IDE disk that is over 40 gigabytes, or Serial ATA (SATA) disk that is over 500 gigabytes.
3. Try starting the installation at night. Start the installation, and go to bed when the installer starts copying the files (this will usually take anywhere from ten minutes to two hours). Assume it will take the whole night to copy the files, and in the morning, finish the last minute steps.
FOR WARNING:
1. Be sure to back up everything before you do this, unless you are upgrading. However, it is wise to back up while upgrading, too.
2. If you are installing Windows and you go online, be sure to install antivirus software before you do so.
source: http://www.wikihow.com/Install-a-New-Operating-System-on-Your-Computer
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