Yes, but that is most pros.... If you are just a hobbyist, a single computer is fine. Maybe a dual-boot system can help you keep a stable recording system, otherwise, a regular PC is fine. And take a good look at the new Intel Macs.

They can run Mac or Windows OS's, and a lot of PC music programs run quite well in Windows, even on the Mac hardware... and zero viruses, trojans and malware.