When your computer gets slow, it may be time to start a clean new start. Regularly formatting and reinstalling your operating system can run your computer much longer than you think. It eliminates junk files and things that result in slow performance. If you regularly backup your files, it should take only about an hour.

Method.1 Windows. 

1. Obtain or create a Windows installation disc or USB drive. This is the easiest way to format your computer and start over. The disk must be the same version of Windows as the one you have installed. For example, if you are using Windows 7, you must have a Windows 7 installation disc. You can either use the disc supplied with your computer or create one yourself. You need a blank DVD or a USB stick with at least 4 GB of free space.
Windows 7: Download the ISO file with your product key from Microsoft . Then download the Windows DVD / USB Download Tool to create an installation DVD or an installation USB flash drive with the just downloaded ISO file.
Windows 8: Go to the Microsoft Windows 8.1 download page and click on the button “Create Media”. Run the tool and follow the instructions to create an installation DVD or installation USB flash drive.
Windows 10: Go to the Windows 10 download page and click on the button “Download Tool Now”. Follow the instructions in the tool to download the Windows 10 files and create a DVD or USB flash drive for installation.

2. Make a backup of all the files you want to keep. When you format your computer and reinstall Windows, all the files on the hard disk are deleted. Make sure you save all your important files to another location, such as an external hard drive or the cloud. All your programs will need to be reinstalled afterwards.
Get backed up data for a tutorial to secure your important files.

3. Boats from the installation DVD or the USB stick. If everything important has been secured, you can start formatting and reinstalling. You will boot your computer from the installation DVD or USB stick instead of the hard drive. You have to set your computer accordingly. How you do this depends on whether your computer came with Windows 7 or earlier or Windows 8 or later (BIOS vs. UEFI).
Windows 7 or earlier (BIOS): Restart your computer, then press the button to enter the BIOS. This key is displayed on the screen during startup before Windows is loaded. Usually it’s the keys F2, F10, F11or Entf. Open the BOOT menu and set your DVD drive or USB stick as the primary boot media.
Windows 8 or later (UEFI): Go to the Start menu and right-click on the power button. Press ⇧ Shiftand click on “Restart”. From the “Troubleshooting” menu, choose “Advanced Options.” Click on the “UEFI Firmware Settings” button to open the UEFI menu. In the boot section of this menu you can change the boot order so that your computer starts from the USB stick or the DVD drive.

4. Start with the installation. Press any key on your keyboard when prompted to load the Windows Setup program. It may take several minutes for all required files to load.

5. Select the language options.

6. Enter the product key. When you install Windows 8 or later, you will be prompted for your Windows product key. When you install Windows 7, you will be prompted for the product key after the installation is complete. You can skip this step if you want to enter the product key later.

7. Choose the “custom” installation. So you can erase all data on your computer and start over.

8.Select the drive where Windows is currently installed. It’s listed as a “primary” drive and is usually labeled with your version of Windows.

9.Click the “Drive Options” button and then “Delete. ” This will erase the partition and all data on it. It will be converted to unallocated space.
You can repeat this for any other partitions you want to delete and add to your main partition. All data on these partitions will also be deleted. Click “Expand” to combine blocks with unallocated space into a single partition.
You can divide your partition into several partitions, if you want. This can be helpful for organizing the files. Choose the unallocated space and click “New” to create new partitions from it. Just make sure that the partition where you want to install Windows is at least 20 GB.

10. Select the partition on which you want to install Windows, and click “Next. ” This will start the installation of Windows. Copying the files and installing takes about 20 minutes.

11. Create your user account. When the copying of the files is finished, you will be prompted to create your user account. This account has admin rights. You will also be asked to enter a name for the computer. This is the name that identifies your computer on the network.

12. Enter your product key (Windows 7). When you install Windows 7, you will be prompted to enter your product key. You can skip this right now if you want to enter it later.

13. Choose your update settings for Windows. Most users should choose the “recommended” options to make sure everything stays up to date and secure.

14. Set date and time. Your computer should automatically pick the right date and time, but you may have to make manual changes.

15. Identify the type of network you are connected to. Choose the species that best suits your environment. This affects your network security and sharing settings.

16. Start using Windows. After selecting the network type, you will come to the Windows desktop. If you have not previously entered your product key, you will be prompted to do so now.

Method. 2 Mac

1. Make a backup of all important files. If you reinstall OS X, all your files will be deleted. Make sure you copy all your important documents, pictures, videos, and other files to a safe place, such as an external hard drive or the cloud. Get backed up data for a tutorial to secure your important files.

2. Restart your computer and press on after the start sound . ⌘ Command+ R . Release the button when you see the Apple logo.

3. Choose the WLAN you want to connect to. You may be asked to choose the network you want to connect to. If you do not have Wi-Fi, you need to connect via Ethernet. You need an internet connection to reinstall OS X.
You can also click on the Wi-Fi icon in the top right corner and select the network you want to use.

4. Open the “Disk Utility” in the recovery menu. This will open a new window showing all installed drives on your computer.

5. Choose your hard drive and click “Format. ” You can leave the settings at their default values ​​and give the drive a new name if you want. Click on “Format” to confirm. Close the Disk Utility as soon as the data clearing is complete to return to the recovery menu.

6. Select “Reinstall OS X” and click “Continue. ” This opens the OS X installer.

7. Read the license agreements and agree. You must accept them to proceed with the installation.

8. Select the drive whose data you just deleted using the Disk Utility.

9. Enter your Apple ID. You will be prompted to enter your Apple ID to verify that you own the license for your operating system.

10. Wait for files to download.

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