Hard disk space problem

Question

Hi all,

I have one problem of my computer.

My Hard disk size is 40 Gb.

Programfile , windows , document and setting and my data size are 15 GB.

but my hard disk space is full ,  I don't understood, how my hard disk space is full.

I have remove all temp file, remove unused file in registry , scan computer with antivirus software.

Any one please help me.

Thanks,
Jitendra Patel