1. which is better for deleting stuff so it cant be recovered like browser temp files etc to make browsing more secure. privazer or east tec eraser
2. i accidentally deleted an entry in ccleaner without uninstalling the program how do i make it reappear in the installed programs list
Finding a temp files is one thing and deleting (shredding it) is totally another. Every tool that has an option for shredding the files using various methods can be considered as safe. No matter what tool is using this algorithms.
If you shred files using Random Data Method, it is already considered unrecoverable, in the real world.
Every more secure methods (US DoD, Steiner, Guthman) are slower. These are made for governments to shred their sensitive files as they have sophisticated tools for recovering them. But again, if you shred your file by the fastest method, no software made for the wide-public can recover it properly.