DP Shredder is a tool that consists of two basic functions, both related to deleting information from your PC you want no-one to see, in a way so that it can`t be recovered.
On the one hand, DP Shredder deletes all the files and folders you indicate; once deleted the second part starts: it overwrites the deleted zone so that it is totally impossible to recover. For this it uses the following methods: Zero, Pseudoram Data, RCMP (DSX), US DoD 5220.22-M (E), US DoD 5220.22-M (ECE) and Gutmann 35x.
DP Shredder is totally free.