To reinstall Windows Vista, back up your files, and format your hard drive by using the Windows Vista installation disc. Set your optical drive as the primary boot device in the BIOS settings, insert the installation disc, and follow the installation wizard instructions to complete the process.
- Back up your files
Connect an external hard drive, or a USB flash drive, to your computer. Make sure that whichever device you use for backup has more than enough space for the files. Locate the files and folder you wish to back up, right-click on them, and select the Send To option to transfer the content to the desired device.
- Set your optical drive as the primary boot device
Restart your computer, and pay attention to the message that appears near the bottom of the screen. This message informs you what key to press to access the BIOS settings. When the message appears, keep pressing the displayed key until BIOS is activated. Find the Primary Boot Device settings, select your optical drive, and move it to the top of the list. Select the Save and Exit option, and press Yes to confirm the change.
- Install Windows Vista
Insert your Windows Vista installation disc, and restart your computer. Once the setup finishes loading the necessary files, modify the Time and Currency, Language and Input Method parameters, and click on Next. Click on the Install Now button, type in the product key in the appropriate field, and click Next. Accept the license agreement, and select the Custom option. Click on the Drive Options (Advanced) link, and delete the existing partition. Create a new partition, choose how much space you wish to assign to it, and click Next. Follow the installation wizard instructions to complete the process, and transfer back the files you backed up previously.