How do I clear all data on my computer?

I want to have my computer like i just pulled it out of the box.





But the computer says that the file that helps me do that is infected so it wont let me use it.





PLEASE HELP!!!!!How do I clear all data on my computer?
Step 1


Backup any computer data that you wish to save. Resetting Windows XP will completely wipe your hard drive and delete all files on your computer. You may backup your computer using blank CDs/DVDs, an external hard drive or an online backup service such as Mozy.com.





Step 2


Insert the original Windows XP installation disk into the CD-ROM drive of your computer.





Step 3


Click the Start menu button in the lower left-hand corner of Windows XP and select Restart to reboot your computer.





Step 4


Press any key on your keyboard during the booting process to launch the Windows XP installation setup screen.





Step 5


Choose Enter Setup on the setup screen. Do not click Repair. After selecting Enter Setup, press the Enter key on your keyboard.





Step 6


Review the licensing terms provided by Microsoft to all users of the Windows XP operating system. Press the F8 key on your keyboard to confirm that you have read these terms and agree to them.





Step 7


Wait for the Windows XP installation disk to scan your hard drive and locate your current Windows XP installation. Select the target hard drive partition in which you wish to reset and restore the Windows XP operating system. Typically, the default drive is the C:\\ partition.





Step 8


Select the type of Windows file system that you wish to revert to from the setup screen. Click Enter after making your selection.


Step 9


Press Enter on the next screen to prompt the setup software to begin the Windows XP reset process. Wait for the entire reinstall process to complete before closing the dialog box. Depending on the size of your hard drive and the speed of your computer processor, this process may take several hours.





Step 10


Type your entire Windows XP registration code at the end of the installation process.





Step 11


Enter the settings for the Windows XP reset, such as your time zone and name. This will erase any current settings in your old Windows XP installation.





Step 12


Press any key to complete the installation and restart your PC.How do I clear all data on my computer?
Just do as I say.............





Step 1


Go to Darik's Boot and Nuke website. There you will find a brief description of the program and then the ';Download'; section.


Step 2


Click on the README.TXT file if you haven't used this program before. This tells you about the program, how to download it onto a floppy, USB drive, or a CD, and how to use the program.


Step 3


Once you have reviewed the readme file, go back and click on the download for either CD and DVD media or floppy disks and USB flash drives .


Step 4


Once you have the program downloaded, re-boot the computer. The readme file has some instructions for how to do this, since the program cannot be started from within Windows, and you need to have the DBAN program start before the operating system on the hard drive is started.


Step 5


Type ';autonuke'; at the boot prompt to wipe all devices on the computer without confirmation. If you need further help, support is available through the website. Be sure to follow the protocol, outlined within the README file, to get support.
format your computer.
u need the disks that came with it to do a complete reformat/reinstall