Every oracle product has it own documentation. If you go to download page you can see the documentation tab http://www.oracle.com/technetwork/developer-tools/developer-suite/downloads/index.html so you can read the installation details. If you have any issue while installing you can search Oracle technology Network or Oracle Support Pages
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Always search the forum to see if someone else has posted a question similar to yours. How to install Oracle Developer Suite (ODS) 10g on Windows 7 is a common question. Please see my reply to this post: Forms problem in Window 7 64 bit. While this question was specific to Windows 7 64-bit, the installation steps I list are the same for 32 or 64-bit. Also, if you are installing on a "Home" edition of Windows 7 - it will not work. You must have a "Professional" edition or higher.
Hope this helps,
Craig B-) If someone's response is helpful or correct, please mark it accordingly.