Best Security Program

I am looking for opinions on the best security program to permanately erasing things that have been deleted (i.e. browsing history, cookies, stored documents that have been deleted). I do not want to wipe any drives clean, I just want to make sure that the files I have already deleted are truely deleted.

For example, I had to check my personal e-mail at work yesterday, and while I trust my employer and have nothing on my e-mail to hide, I deleted the browsing history but want to make sure it is overwritten and cannot be recovered. I want to do the same for other files as well

 

I like DiskRedactor.
It wipes only the free space and leaves files alone.

http://www.cezeo.com/products/disk-redactor/

Sorry it's not from MG, but have used it for several years with no problems.

 

I use Eraser. It adds a right click menu item so I can erase instead of delete.
http://majorgeeks.com/Eraser_d4221.html

 

If your employer has full-time IT geeks, you might want to re-think installing this on a work PC.

Put yourself in your boss' place: If you discovered an employee installed a file shredding program on their workstation, why did they do it? What are they trying to hide?

I'm not suggesting you have (or will) do anything illegal or immoral. It's just that it may cause more rumors or unfounded accusations than it's worth.