One important thing that most of us always forget to do when we sell or give away our PCs is erase all our files. Many of us do not know that simply deleting them won't do the job. You should use a software like Wipe hard drive to protect all your data from falling into the wrong hands. What's great about this software is it only erases the remnants of your deleted data and it can clean and restore your infected files. So if you had been a victim of spyware or malware, Wipe Hard Drive can easily restore your important data.