Maybe your new PCs will be installed Windows 7. But you need to know if the devices or software can work with Windows 7. Do worry about it now. Because Microsoft released Windows 7 Compatibility Center. With its help, we can figure out if Windows 7 will work with all your stuff.
You can search for your devices and software by name via the website. Then you can get the answer that whether or not they are compatible with Windows 7 operating system.
I think you can also search the hardware drivers for Windwos 7 easily, such as Printers & Scanners, MP3 & Media Players and so on.