Here is the link.
Oracle Database 10g Release 2 (10.2.0.4) for Microsoft Windows Vista x64 and Microsoft Windows Server 2008 x64
For 32-bit OS, you can get the software from:
Oracle Database 10g Release 2 (10.2.0.3/10.2.0.4) for Microsoft Windows Vista and Windows 2008
All the database software can be downloaded from:
Oracle Database Software Downloads
You can download the software from "My Oracle Support" website, and select Windows Server 2003 64-bit OS -- Search for (Patch 6810189: 10.2.0.4.0 PATCH SET FOR ORACLE DATABASE SERVER).
i need oracle 10g client can any one help me to download it
If you are installing the software on Windows 64-bit (as mentioned in your first post), please refer to:
Oracle Database 10g Release 2 (10.2.0.1.0) -- Enterprise/Standard Edition for Microsoft Windows (x64)