Installation of Oracle 11gR2 64-bit client on Windows 7 is even trickier compared to Oracle 32-bit client installation. In fact after some series of installations, I do recommend installing Oracle client 32-bit on Windows 7 64-bit version, unless you have solid technical restrictions of that. This will avoid various installation issues as well as some client software incompatibility issues. I give however below a short installation plan for Oracle 11gR2 64-bit client with possible issues you can encounter during and after it. Read also my other article for some more tips on that: Oracle 11gR2 client installation on Windows 7 troubleshooting.
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Installation of Oracle 11gR2 client on Windows 7 32-bit using Oracle Universal Installer (OUI) failing on prerequisite with below mentioned error. Read more »