​Use hard-drive wiping software, which will overwrite your information with random ones and zeros. 
According to the experts, you have to back-up everything that you want to keep (install on the computer or hard drive), and then run hard-drive wiping software, which will overwrite your information with random ones and zeros.  The following programs are recommended by IT professionals for this task:

• Active@KillDisk – a free hard-drive eraser that overwrites using zeros.  This program can be upgraded to a professional version that conforms to U.S. Department of Defense (DOD) standards.
• WipeDrive – overwrites your data as many ties as you like and runs a verification test.

 

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