RegSeeker is a perfect companion for your Windows registry
http://www.hoverdesk.net/freeware.htm



free office suite

OpenOffice.org is a multiplatform and multilingual office suite and an open-source project. Compatible with all other major office suites, the product is free to download, use, and distribute. To help build the community.
http://www.openoffice.org/


Crap Cleaner
http://www.mrbass.org/freeware/crapcleaner/
http://www.ccleaner.com/

Web Browser: Firefox with Adblock Plus and Fasterfox extensions installed.(This is the one I use)
http://www.mozilla.com/firefox/
http://adblockplus.org/

Another web browser I like is Opera...fast and efficient
http://www.opera.com/

Media Player Codecs (play every format known to man) k-lite Mega Codec Pack
http://www.codecpackguide.com/klmcodec.htm


Organizer, tasks and calendar on your desktop wallpaper
http://www.xemico.com/adc/


Anti-Twin is a useful tool that helps you to increase your hard disk space by searching it for duplicate files. Found similar or identical files can either be sent to the recycle bin or directly deleted.
http://www.rosenthal-software.com/en/antitwin/
http://www.rosenthal-software.com/en/antitwin/download.html


WordWeb is a one-click English thesaurus and dictionary for Windows that can look up words from in almost any program. It works off-line, but can also look up words in web references such as the Wikipedia encyclopedia.
http://wordweb.info/free/