Some important freeware software's you must need:-
CCLEANER CCleaner is the number-one tool for cleaning your Windows PC. It protects your privacy online and makes your computer faster and more secure.

K-Lite Mega Codec Pack K-Lite Mega Codec Pack is a collection of codecs and related tools. 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.
JAVA Java technology allows you to work and play in a secure computing environment.Java allows you to play online games, chat with people around the world, calculate your mortgage interest, and view images in 3D, just to name a few.
Adobe Reader
Adobe Reader is the PDF file viewer that can open and interact with all PDF documents. Use Adobe Reader to view, search, digitally sign, verify, print, and collaborate on Adobe PDF files.
7-ZIP7-Zip is a file archiver with a high compression ratio.
ADOBE FLASH PLAYERAdobe Flash Player is the high performance, lightweight, highly expressive client runtime that delivers powerful and consistent user experiences across major operating systems, browsers, mobile phones and devices.Specific versions are available for Internet Explorer and other browsers.
DEFRAGGLER Use Defraggler to defrag your entire hard drive, or individual files - unique in the industry. This compact and portable Windows application supports NTFS and FAT32 file systems.
VLC MEDIA PLAYER VLC media player is a highly portable multimedia player for various audio and video formats as well as DVDs, VCDs, and various streaming protocols without external codec or program.
WINAMPWinamp is a skinnable, multi-format media player.Winamp supports a wide variety of contemporary and specialized music file formats, including MIDI, MOD, MPEG-1 audio layers 1 and 2, AAC, M4A, FLAC, WAV, OGG Vorbis, and Windows Media Audio. It supports gapless playback for MP3 and AAC, and Replay Gain for volume leveling across tracks. In addition, Winamp can play and import music from audio CDs, optionally with CD-Text, and can also burn music to CDs. Winamp supports playback of Windows Media Video and Nullsoft Streaming Video, as well as most of the video formats supported by Windows Media Player. 5.1 Surround sound is supported where formats and decoders allow.
CPU-ZCPU-Z is a freeware utility that gathers information on some of the main devices of your system. CPU-Z does not need to be installed, just unzip the files in a directory and run the .exe. In order to remove the program, just delete the files. The program does not copy any file in any Windows directory, nor write to the registry.
Yahoo! Messenger
Keep friends at your fingertips with the new Yahoo! Messenger.
GOOGLE TALKThe Google Talk downloadable application for Windows offers many features for communicating with your friends and family.
DAEMON TOOLS
With DAEMON Tools you can back up your physical CD/DVD/HD DVD/Blu-ray discs into "virtual discs" or so called "disc image" files, which run directly on your hard drive. You can also work with images created by other burning programs! DAEMON Tools supports variety of image types. Use CD/DVD image converter to have one format images in your Image Catalog!
NOTE:- Explanations taken from
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