How do I change the default installation

Guys, I have a question about setting the Windows' default install directory. I have partitioned my hard drive to two parts. One of them with lesser memory has windows installed in it. When I install anything it install it in that directory. Now what I want is that I want to use some different directory as a default directory for the installation files and I also want to use some different 'temp' directory. I don't have any idea about this. Is it possible to do that? If yes then please post me the way to do that. Thank you.

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