quick question

[Your Dog Sucks]

My current drive is really full and my windows is really slow

if I get a new sata II 500gb drive would it be possible to install windows on the new one and use my current drive as a data storage.?
I never done this before and I am really not sure if it will work,

 

[Your Dog Sucks]

ok thanks. I wish there was a step by step guide how to do it though.