'Windows Defender', and 'Handy File Tool'

Windows Defender

Microsoft Windows Defender (Beta 2) is a free program that helps you stay productive by protecting your computer against pop-ups, slow performance and security threats caused by Spyware and other potentially unwanted software. Note that this software is still in the Beta Stage and may produce false positives! In other words: don't completely rely on it for "the truth".

http://www.microsoft.com

Handy File Tool

Handy File Tool (HFT) is a very fast and simple file manager. It has some internal utilities such as Renamer, Replacer and Finder. HFT has utilities necessary for webmasters, programmers and anybody who is concerned with computers. Imagine that you need to process hundreds of files. It would take you many hours to do this manually. With HFT you can solve these problems with one mouse click. You can even process files from several directories or even disks simultaneously, using Basket a clipboard for files. HFT has two-panel interface calls to mind the popular Norton Commander, but here you have the Basket, a clipboard for files. You can even process files from several directories or even disks simultaneously (see Basket drive in the help menu of the program). The suite's main tools, Finder, Replacer, and Renamer, help you make quick work of file searching, text replacement, and bulk renaming across a range of file formats and attributes.

http://www.handyfiletool.com/index.html