I resolved my problem by using such a good application from Cnet.
I used it after reading reviews by users and experts.
I am very happy with this application 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 very useful for me.
thanx to Cnet to provide a good tool.
I think if you arrange your data properly then you don't need to install any software to manage your file for eg _ defragment your system every weak, delete temprary files just and if you need pravicy then you can install folder lock software......