Which oracle should I download for windows 7 x64? My os is: windows 7 x64

I tried to download oracle and install it in my computer, but I have downloaded 3 different oracle releases(including oracle 11G), they can't be installed. 

They reported such error:

Need os version: 5.1, ..., 6.0
But found: 6.1


I have spent a day to download them, that I don't know which one I should try.

Is there any oracle 10G can run in windows 7 x64? If not, oracle 11G would be fine.
I'm re-reading your post, trying to determine if you're having problems installing 10g, 11g or both.  Whichever, I found an article on how to install Oracle 11g on Windows 7, describing the problem that you're having above.  Basically, the installer should present you with an option to override the prerequisite OS check.  Follow the link, go to step #3 and see if that helps you.