You may or may not know that when you drag items to the trash on your computer, they aren't permanently deleted. Just watch an episode of your favorite CSI show, and you'll see that its possible to recover files that haven't been deleted properly. And while I'm sure you're not guilty of any CSI type crimes (or are you???), I'm sure you want to figure out how to permanently delete your files and keep your private things private -- after all everyone has to have some secrets!
Why emptying your recycling bin doesn't permanently delete your files

When you tell your computer to empty its recycling bin, your operating system only deletes the records it has of the files you want to delete. Yet the files still remain on the hard drive memory.
Here's an analogy: If you think of your files as books in a library and you decide you no longer have use for a certain book. Emptying the trash is equivalent to removing the entry in the library's card catalog. The book is still there but not easily found by everyday visitors. But if someone really wanted to find it, and had a clue where to look, they quite possibly do so since it is still physically there.
What it means to permanently delete a file

To permanently delete a file, you need to not only delete its record, but also overwrite the physical portion of the hard drive where it lives. A low level format is equivalent to replacing your private file with random bits (1's and 0's). Continuing with the library analogy you need to remove remove the book, shred it, light up in flames and possibly replace it with a different book
A simple way to permanently delete?

According to Microsoft, there is a keyboard shortcut in Windows to, quote, "permanently delete files". You do this by selecting your file and hitting SHIFT+DEL. Convinced? Neither am I. What they're really explaining is a shortcut from having to move the item to the trash and then emptying the trash.
Take it a step further

Here's a poor man's version of permanent deletion. Delete your files, empty your recycle bin, and run Disk Defragmenter located in the Start menu under Accessories/System Tools. What this will do is optimize your hard drive by rearranging (most) of your files, and in doing so will most likely overwrite the files you want permanently deleted. Nice!
Do it right and do it better

While performing a defragmentation will probably do the trick, it's really not a viable solution. Waiting for disk defragmentation is not something I'd do every time I wanted to do a permanent deletion. The defragmentation process is waaaaay too long. The right way to how to permanently and quickly delete files is to use a program specifically designed for that purpose. You're in luck too because most Windows operating systems have a command line tool called CIPHER to do the trick!
Here's how to use CIPHER:
1. After closing all windows, open up a command window.
2. Type the following: cipher /w:driveletter:\foldername where driveletter and foldername correspond to the drive a location of where your deleted file used to live.
3. Sit back and enjoy your freedom and privacy while your file is truly permanently deleted!
Here's an example:
I have a picture I want permanently deleted which stored on my computer at the following location:
C:\images\scandalous_picture.jpg
After deleting this picture and emptying the recycle bin, I would type the following (in a command prompt)

C:>cipher /w:C:\images
I can then move on to my life of privacy and carefree surfing!

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Ooh, that's a useful last tip! I didn't know that.
Does the same apply to Linux? One you delete it, you can get it back? ...I haven't really looked into that sort of stuff for Linux

Jam

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You raise a good point there Jam. Im not sure if its the same for linux. I think the idea is that with all hard-drives is that data is not removed properly unless written over so I guess it may be the same for linux. I will have to have a look into that one.

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That is really good info thanks! Just a thought though... if I did that then someone did a system restore would it put the 'ciphered' file back?

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Hmmm... Neat tool, but is there an easier way? I have deleted numerous amounts of files/pictures/ect ect. I'd have to type in that command for each one of those semi-deleted files?

well, time to cipher it up =]
thanks for the post bro

hmm im going to try that out soon o.o sounds nice does it work with vista ?

It does indeed my friend

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sweet now to get rid of all those old pr0n > haha just kidding nah just some private stuff from my previous job on my laptop that i want to get perm. removed ^_^

nice post! thanks! this will definitely come in handy when trying to get more hard drive space.

nicee guide this might be useful to me

What if you reboot your computer? Does that perm-delete it as well?

Rebooting will just reboot the computer. Unless the files were saved in a RAM disk they will remain there...

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Ooh, nice. I don't have anything I need to permanetly delete but it's nice to now how incase I ever do.

Well SPAWAR is going to nail my nuts to the wall for saying this but the only way to really delete a file is to pulverize the hard disk. I,ve been to many HD destruction parties.
rock on.........