How do I remove only my personal information from a computer?

Unfortunately, there is no practical way to determine what is and what isn't personal information. Securing a computer to give away is an all-or-nothing proposition.

I want to give a computer to a friend’s son, so I want to wipe all of my personal information from it. But everything I’ve read also wipes out useful programs that I keep for him to use. Do any of your articles show the best way to get rid of personal information without getting rid of everything?

The short answer here is no. The problem is that there is really no distinction between what is and is not personal information.

Data, data everywhere!

When you’ve been using a computer for a certain amount of time, information that you or I might consider to be personal is distributed in multiple places: in the registry, in data files, in the programs that are installed, and even those programs themselves may save data in completely unknown and non-standard locations.

There is simply no way to know; there’s no way to scour the machine, identifying what is and is not personal information or what should and should not be erased.

ExplosionThe nuclear option

The only safe thing to do is to erase the entire machine.

Use a tool like Dban (Darik’s Boot and Nuke) to first completely erase the entire hard disk.

Then, install Windows from scratch. You’ll also install the applications that you want to make available to this friend from scratch.

Only then are you really safe.

No installation media?

Now, if you don’t have the installation media, that’s unfortunate.

The solution is to grab a free operating system like one of the Linux distributions and make that available. Or perhaps purchase a copy of Windows to give with the machine so that you do have installation media.

But the bottom line here is that there really isn’t a safe way to give a machine with only “some” of the information removed from it. For safety’s sake, it really is an all-or-nothing proposition.


  1. James

    Wouldn’t there be another option?

    If you don’t have the installation media, but your computer happens to have the hidden install partition in tact, it would seem to me that the thing to do would be to use the install partition to reformat and reinstall Windows and whatever else came with the computer from the factory.

    For those who are slightly more paranoid, they could connect the hard drive to another computer to reformat the visible partitions (but not the hidden install partition) and then use something the CCleaner to wipe the visible partition. Then, use the hidden install partition to install Windows and whatever else came with the computer from the factory.

Leave a reply:

Before commenting please:

  • Read the article. Seriously. You'd be shocked at how many people make comments that prove they didn't.
  • Comment only on the article. If you have a new, unrelated question start with the search box at the top of the page.
  • Don't post personal information. Email addresses, phone numbers and such will be removed.

VERY IMPORTANT: because of a rise in comment spam that's making it through our filters any comments that do not add to the discussion - typically off topic or content-free comments - run a very high risk of being flagged as spam and removed.

If you have a new question unrelated to the article above, ask it on the Ask Leo! ask-a-question page.

Your email address will not be published. Required fields are marked *