Do you know that there is software available to recover files even if you deleted it from recycle bin? The data stays on your hard drive until it is written over by new data. This means that there is a period between you deleting a file and the time when new data is written in that area of hard disk. For immediate and permanent deletion of data, try Freeraser.

Freeraser overwrites the area of harddisk where your data was before deleting. It has three levels od deletion. “Fast” overwrites your data with random information. “Forced” goes over it three times. “Ultimate” overwrites your files 35 times. Nothing much left after that.

Website: Freeraser