The issue is with your processor, Kaby Lake and later generations of processors do not support Win 7 operating system. You can try to install your special applications with compatibility mode in Windows 10. Otherwise, getting an older model with Windows 7 support such as Precision 3620.
Hello, We have a Dell Precision 3630 tower that shipped with windows 10. We are trying to install windows 7 on it due to special applications that require windows 7. We have tried doing so with a bootable USB but found out later that the Precision 3630's BIOS does not support windows 7. Is there any BIOS version of the Precision 3630 that supports windows 7? I have already checked the Precision's 3630 drivers on Dell's website and did not find it there. I also saw that another user had a similar issue in 2020 and had no replies. Thank you for your help. Best regards, Ahmad Mansour
Windows 7 on Precision 3630