Hey Bill,
Windows 7 can be installed on some of the newer business PCs. There are some requirements and settings you should be aware of.
- First, you cannot install Windows 7 on a computer with a 7th generation processor.
- You'll need to either change the TPM version on the PC or install a hotfix from Microsoft.
- You must use legacy mode (non-UEFI) in the BIOS.
- You need your own copy of Windows 7 and a license for Windows 10 Professional.
You can find steps and more information at http://www.hp.com/support/Windows7and10TPMFAQ
Thanks,
Wes