what is the best managing software for all windows OS?

[problemkiller]

I have 1 TB Hard Drive and 750 GB space occupied with my data.
I need to free some space to remove unused or large size data.

Anyone can help me to guide how can i manage my data? how can I view data the which files are largest or unused or duplicate cause occupy space?

Is any best software or tool to manage or viewing data and finding duplicate files and removing them to freing space on my hard drive and supported on all windows operating system?

thanx to allow a qurey here.

[Raphael]

Hmm to remove junk files use ccleaner. And to manage your data there is a program called everything or something like that.

[Joey]

I have a similar drive situation. It does get really crazy sometimes when I am trying to look for a file within 2 TB worth of data. What I do is index all of my drives using the free Google Desktop Search. Then I can more easily find the file.

I do not know of any data managers. But I did look around and found this. It might help you out.
http://www.simpledirectoryanalyzer.tk/

[problemkiller]

thanx to everyone to give valuable suggestion.
I read reviews an software utility from Cnet and after reading the review, i used it for the same.
I quite happy with that utility named Advanced System Optimizer.
1. I could view my large 100 files by its Disk Explorer and removed unused file to save space around 10GB .
2. I could find duplicate files by its Duplicate Files Remover and removed all duplicate except original one and saved around 5GB space .
this is a great tool for me.
thanx to all and Cnet to provide a good data managing and optimizing tool.

[WonderDocTeam]

You can use de-fragmentation for your all partition of hard drive. By this you can manage your unused blank space for hard disk.