How to free up disk space?

Hi,
I want to know how can i free up my disk space?
Any special tools i need to download & install?
regards,
Bhairav

Why you need to download or install any tool, windows have its own tool
Use disk clean up tool.
Start-All Programs-Accessories-System Tools-Disk Cleanup
1)Remove temporary Internet files.
2)Remove downloaded program files (such as Microsoft ActiveX controls and Java applets).
3)Empty the Recycle Bin.
4)Remove Windows temporary files.
5)Remove optional Windows components that you don't use.
6)Remove installed programs that you no longer use.

Thanks for the reply.