The most critical factor in your download journey is versioning. Oracle, the developer of VirtualBox, dropped support for 32-bit host operating systems starting with version 6.1.
If your physical computer is running a 32-bit version of Windows 7, you must download or 6.0.x from the Oracle VM VirtualBox builds archive. How to Download VirtualBox for 32-bit Windows 7
32-bit Windows 7 systems are often limited by the 4GB RAM ceiling. To keep your virtual machines running smoothly, use these settings:
Windows 7 may prompt you several times to "Install this driver software." Click Install every time to ensure the virtual bridge and host adapters work correctly.
The final version that allowed 32-bit hosts but prioritized 64-bit performance. VirtualBox 7.0+: Requires a 64-bit operating system to run.
During installation, the installer will reset your network connection. Do not be alarmed if your internet drops for a few seconds.