Turn Your Old PC Into a NAS Home Server 4. You can install ChromeOS Flex onto an old PC or Mac to approximate a Chromebook; it can even run from a portable flash drive. So turn that old PC into a Wi-Fi hotspot to share an internet connection. If you run into problems, read 4 Ways to Run Old Games on Your Modern PC. That's a perfect job for an old PC, as long as the system can handle being on and networked full-time.