Windows
avast! antivirus Home Edition is available free of charge for non-commercial home use and is very easy to setup and use.
Protects you from all kinds of Virus and malware infections.
DriverMax allows you to download the latest driver updates for your computer.
You can also export all your current drivers (or just the ones that work ok) to a folder or a compressed file.
After reinstalling Windows all drivers will be back in place in less than 5 minutes sparing you of searching, inserting disc after disk and losing precious time.
Looks like just the old version of Windows media player but is very powerful player with host of features and can play nearly all codecs like divx,quicktime etc.
TeraCopy is a compact program designed to copy and move files at the maximum possible speed. An super essential utility for windows.
Download the latest stable version.
WordWeb is a one-click English thesaurus and dictionary for Windows that can look up words in almost any program.
Seach instanly any file or folder within your computer nomatter how bigger your drive is. The best searching utility I have ever seen.
An light weight optical media emulation program.
Note : Optical media emulation means reading and image file {iso,nrg etc. }
without needing to burn it on a disk.
A basic Firewall to protect your from network intrusions. The basic firewall is gud enough for a home user.
The best browser with lots of customizations and addons for an awesome browsing experiece.
A small and Fast pdf reader to leave keep your sistem light.
An essential utility for compression and decompression of multiple compression formats such as .rar,.zip,etc.
Java runtime environment [JRE]
Experience the power of java by installing this software. Also required by browsers for many webapplications.
Robust office suite with easy to use interface. Best of all,its free !
Ramblings by Anurag Arora 
thanks for giving me your views…………..