When you try to install Oracle Developer Suite on your windows Vista or Windows 7 PC but it’s failing giving an error message "Checking Operating system version must be 5.0, 5.1 or 5.2..... Actual 6.0 or 6.1 - Failed"
What will you do?
Don’t worry, simply follow the following steps, and it will works.
Before installation, right click on setup.exe then click properties, from the tab select compatibility and select windows xp service pac3/pac2 from compatibility mode settings.
And now try to install... it works