By default Windows 7 x64 is not support in Oracle 10g R2, but 10gR2 does support Windows 2008 x64, so it should work with Windows 7 after some tweaking. Tweak the following two files: .\stage\prereq\db\refhost.xml .\stage\prereq\db_prereqs\db\refhost.xml To add the BOLD text below: <certified_systems> <!--Microsoft Windows 7--> <operating_system> <version value="6.1"> </operating_system> </certified_systems> Next edit the ./install/oraparam.ini file making the BOLD changes/addition: [Certified Versions] #You can customise error message shown for failure, provide value for CERTIFIED_VERSION_FAILURE_MESSAGE Windows=5.0,5.1,5.2,6.0, 6.1 Then just run the installer as Administrator and you are done.