Yes its legal
read the faq before using
Download here -no install needed http://www.databack4u.com/snc/download/trashreg.zip
It seems you have to Donate atleast Zero dollars to unlock it delete certain files
Homepage - http://www.databack4u.com/snc/rtkf_eng.html#3Registry Trash Keys Finder (version 3.6.0)Purpose of the program
The main function of RTKF is to allow the removal of unnecessary keys from the Windows registry. Many programs leave keys in the registry, even after program removal using an uninstallation facility provided with the program itself. RTKF allows you to decide whether to delete or leave the keys found. An additional effect (it may be the main aim of some users) of removal of these keys is the "revival" of some programs trial versions after the initial trial period has expired.
The program RTKF is not a 'crack' but is an addition to other "serious" registry cleaning software. It seems there are no infringements of the author's laws: nothing is 'patched' into EXE files and their action is not traced by special "spies". I do not distribute any registration keys, and, at lastly, I do not know anything about trial versions of any programs, which for their requirements could write something hidden. As an RTKF user you simply clean some trash from your computer registry.