Thanks mate but I have installed Windows 7 by removing 3 sticks of RAM hence my question.
Well could be one stick possibly faulty, did you see this http://answers.microsoft.com/en-us/insider/forum/insider_wintp-insider_install/error-code-0x80070570-while-installing-windows-10/54fe45ee-ada1-4e38-9392-13c67b9a582f, was faulty ram in his case, did you try ram test from within Windows as well?
#1 If you’re already in Windows, go to Start or press the Win key and type mem into the search box. The Windows Memory Diagnostic Tool should show in the results, and you can then run it by pressing Enter. A window will pop up asking if you want to reboot now and run the tool or run the tool at the next reboot. Simply choose your preferred option and the next time windows boots it will run the diagnostic test.
Read More: https://www.raymond.cc/blog/test-your-ram-with-microsoft-windows-memory-diagnostic/
Btw I've actually installed an OS before with faulty ram module( was on WinXP), in my case it got worst and the OS went downhill, replaced the ram and all was fine after another reinstall of OS.
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