by 
The Curious Bag
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The best way to delete computer history from a hard drive is to thoroughly delete the contents on it. Deleting the contents of the hard drive with third-party software such as Sure Delete will forever delete all the files on the hard disk. With Sure Delete, you can also delete a particular file.
Download and Install Sure Delete
Download and install Sure Delete from the following link. www.pcworld.com/downloads/file/fid,22393-order,1/description.html
Format the Hard Disk
Go to "Start," "All Programs," "Sure Delete," and then click on "SD Disk." In the "Disk Cleaner Wizard" window that opens, select the drive to clean and then click on "Next." Leave "Block size" and "Number of passes" as they are, click on "Start" and then wait for the process to complete.
Delete a Particular File
Go to "Start," "All Programs," "Sure Delete" and then click on "SD File." In the "File Cleaner Wizard" window that opens, click on the "Add File" button, add the file and then click on "Next." Under "Cleaning Strength," select one of the three cleaning strengths, click on "Next" and then wait for the process to complete. For details about cleaning strength, see the help file (Go to "Start," "All Programs," "Sure Delete" and then click on "User Guide").
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