You have to install another operating system
Restart your computer during the boot process you will see on the screen to press a certain key to enter setup usually the Delete or F2 key
Press and hold that key during the boot up process to enter BIOS then using the arrow keys scroll down to advanced bios features press enter change your first boot device to cd press escape then press f10 to save to cmos to restart
Note this will erase you operating system you will have to have an operating system disk to load it onto you hard drive or create a partition to load another operating system
Note after you have loaded the operating system you should go back and change the first boot device to failsafe or optimised defaults after windows has loaded
your computer will automatically restart it might restart 2 times one to finish the installation
the next will be because the operating system is loaded and will boot from your cd
or
Formatting a hard drive to erase its contents does not mean the files are necessarily gone forever. Using data-recovery software, someone still could retrieve sensitive data and files from your hard drive even after you've formatted it. Instead of simply formatting your hard drive, use disc-cleaning software to permanently erase its contents. Disc-cleaning programs work by repeatedly overwriting the contents of a hard drive with random data patterns, making it virtually impossible to recover the original files. Download and install the freeware program Active@ KillDisk (see Below).
http://www.killdisk.com/downloadfree.htm Click the Windows "Start" button and select KillDisk from the "All Programs" list. Click the check box next to the hard drive you want to erase in the "System Local Disks" menu. Press the "Kill" button. Select the erasing method you want to use from the "Erase Method" drop-down menu. Active@ recommends using the "US DoD 5220.22-M" method. Click "Start" to begin erasing the hard drive. Download and install the freeware program Hard Drive Eraser (see Below).
http://www.harddriveeraser.org/ Click the Windows "Start" button and select Hard Drive Eraser from the "All Programs" list. Check the radio button next to the hard drive you want to erase under "Select Drive to Erase." Select the erasing method you want to use from the "Shredding Scheme" drop-down menu. The developers of Hard Drive Eraser recommend "DoD 5220-22 M" Press the "Start" button to begin erasing the hard drive. Download and install Iolo DriverScrubber (see Below). Click the "Windows" Start button, "All
http://www.iolo.com/ds/3/ Programs" and then the DriverScrubber program icon. Click "Wipe all contents of a drive," and then click "3.5-Inch Floppy Disk." Insert a blank floppy disk and click "Next." Restart your computer with the floppy disk still inserted. Your computer will boot directly to DriveScrubber. Press the down arrow on your keyboard to highlight the hard drive you want to format in the "Available Physical Drives" menu. Press the space bar to select the hard drive. Press "Enter" to continue. Press the down arrow to highlight "Seven Overwrites" in the "Available Data Wiping Methods" menu, and then press the space bar to select it. Press "Enter" to continue. Press "CTRL," "ALT," "Shift" and "W" at the same time to wipe the hard drive. Hope this helps.
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