The installation of Windows is usually done with a CD and many users make the mistake of inserting the disc and starting the installation directly over the old system. This should not be done, because acting in this way, you fill the system partition on the hard disk of unnecessary data to create order instead of chaos.
To do the right thing, it is extremely important to install bypassing the old system, and completely removing about it any reminder by formatting the C drive. Therefore, before you install Windows, copy all the important data to another hard drive partition, or external media. Don't forget to export your address book, Outlook email, bookmarks from your browser.
Once you are convinced that there is nothing to lose, restart the computer. The moment you switch on hold down the F2 key (for the majority of laptops), or F3 (for Sony and Dell), or Esc (for Toshiba), or F10 (HP Compaq), or Del (for some models of laptops), and you get into the BIOS – basic computer system.
Here you need to give the command the laptopto not boot from hard disk as usual, but with the CD-ROM. To do this, navigate menu with the arrow keys, go to Advanced BIOS features, and select CD-ROM (or DVD-ROM for First Boot Device. In various versions of BIOS names may be slightly different, but the principle will remain the same – want to boot from disk. To exit, press F10, and the offer to save changes and exit, answer Yes.
Now insert the installation disc and carefully read all you will offer the Windows setup Wizard, you will agree first to install the system, then format the drive With, and eventually wait for the final Windows setup. Don't miss a moment of the first reboot during the installation process, log back into the BIOS and change the boot settings, returning them to their original appearance.