Hi Ariful,
As per the description, when you try to install Windows 7 from USB drive, it gives you a message: “Proper CD/DVD drive is not inserted or found”. But when you try to install from DVD and select any version of Windows 7 64 bit, it shows “Windows couldn’t find required files that may be corrupted with error code 0x80070570 on the system.
I certainly understand your concern.
I would like to provide you with the information that if the system is configured to install 32 bit operating system, and you are trying to install 64 bit, definitely you will get an error message.
And that is the reason when you installed 64 bit, you were receiving error message and when you installed 32 bit, it went with the smooth installation without any error message.
And if you have the product key, you may refer to the link given below.
Download Windows 7 Disc images (ISO files)
https://www.microsoft.com/en-in/software-download/windows7
For reference:
You may also refer to the article given below and check if that helps.
Windows 7 installation problems: frequently asked questions
I hope this information is helpful.
Please do let us know if you need any further assistance, we will be glad to assist you.
Thank you.