This is a error which I came across while installing Developer Suite 10g on Windows 7 64 bit machine. Initially I went through some of the documents and found out I will have to download compatible version of Developer Suite 11g but then I decided to make some changes in the compatibility of the existing setup file.
Checking operating system version; must be 5.0, 5.1, 5.2 or 6.0. Actual 6.1. Failed
Right click the setup file and click on “Troubleshoot Compatibility”
Click on “Start the program“, Your problem should be fixed
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