If you have an original Windows 7 DVD: copy it to an ISO using ImgBurn or AnyBurn. This ISO will be BIOS-only unless it’s a later OEM UEFI-ready disc.
A: Yes, with careful partition management. Install Windows 10/11 first (UEFI/GPT), shrink a volume, then install Windows 7 on new space – but boot menu may need manual repair via bcdedit . Windows 7 Uefi Iso File Download
To recap, here’s your checklist: