CCleaner (formerly Crap Cleaner) is a freeware system optimization and privacy tool. It removes unused and temporary files from your system – allowing Windows to run faster, more efficiently and giving you more hard disk space. The best part is that it’s fast! (normally taking less than a second to run) and Free.

SUPER is a Simplified Universal Player Encoder & Renderer, a GUI to ffmpeg, mencoder, mplayer, ffmpeg2theora & the theora/vorbis RealProducer plugIn.
SUPER supports a wide variety of input/source file format to play or encode (to & from) without any additional third party software:

Zoom video, open many movies at the same time with high performance. Control 20 levels to fast up and slow down video or audio. Six levels to fast up and slow down MP3 with clear voice. Auto-continue and auto-play with multimedia search engine. Open hidden and system files through quick search engine. Support playing video, MP3, and pictures. Eject and inject all your CD or DVD in the same time.

Audacity is a free audio editor. You can record sounds, play sounds, import and export WAV, AIFF, Ogg Vorbis, and MP3 files, and more.
Use it to edit your sounds using Cut, Copy and Paste (with unlimited Undo), mix tracks together, or apply effects to your recordings. It also has a built-in amplitude envelope editor, a customizable spectrogram mode and a frequency analysis window for audio analysis applications. Built-in effects include Echo, Change Tempo, and Noise Removal, and it also supports VST and LADSPA plug-in effects.

What happens when you cross a Post-it note with a computer? You get Post-it Software Notes, the classic yellow note designed for your PC. It’s software from the company that invented the Post-it note. This digital version of 3M’s famous canary-yellow note is perfect for quick reminders on your computer desktop so you never miss a meeting, event, or thought. With the free Lite version, you can create your own notes with pictures and hyperlinks, stick notes on your computer desktop, and add alarms to your notes as reminders.

SiSoftware’s Sandra (System ANalyser, Diagnostic and Reporting assistant) is a popular troubleshooting tool. It won’t actually fix your PC for you, but it can analyse the various components within your PC and help you figure out where your problems lie.
It can also run a number of benchmark tests to see if your PC is performing properly. This is the free, basic version of the program, but there are three other versions to choose from – Pro Home, Pro Business, Engineer.

K-Lite Codec Pack is a collection of codecs and related tools. Codec is short for Compressor-Decompressor. Codecs are needed for encoding and decoding (playing) audio and video. The K-Lite Codec Pack is designed as a user-friendly solution for playing all your movie files. With the K-Lite Codec Pack you should be able to play all the popular movie formats and even some rare formats.

Recuva (pronounced “recover”) is a freeware data recovery program, developed by Piriform, and runs under Microsoft Windows. It is able to recover files that have been “permanently” deleted and marked by the operating system as free space. The sucess rate of the recovery depends on if the deleted file has been overwritten with another file since its deletion.
Recuva is a freeware Windows utility to restore files that have been accidentally deleted from your computer. This includes files emptied from the Recycle bin as well as images and other files that …

FLV Player is a tool to play Flash FLV and H.264 (MPEG-4) videos with. This utility can come in handy when viewing many FLV and/or H.264 files. The installer comes with optional FLV file-association, so double clicking an FLV file opens and plays the file in FLV Player.
Version 2.0.25 adds ‘video-only’ mode (press [tab] to hide all FLV Player interface elements, note that you can still drag the video around), volume control with [arrow-up] and [arrow-down] keys, timer toggle (normal and milliseconds). Ability to skip forward with [arrow-right] key has …

IrfanView is a fast and compact image viewer/converter. It is trying to be simple for beginners and powerful for professionals.
Many supported file formats and features. Features include: multi-language support, Thumbnail option, Painting, slideshow, toolbar skins, fast directory browsing, batch conversion/editing, multipage editing, file search, change color depth, scanning, cut/crop, IPTC edit, capturing, lossless JPG operations, effects, ICC support, EXE/SCR creating, many hotkeys, command line options and plugins.