You may have heard that "if you delete it within 24 hours, it’s legal" or "if you own the game, downloading a ROM is legal." Generally, There is no 24-hour rule in copyright law. While owning the physical cartridge gives you the right to play the game, it does not legally grant you the right to download a digital copy from the internet.
Searching for "PC ROMs for Windows" usually refers to finding and running digital copies of retro console games on a computer. Because these files are often distributed on unofficial sites, safety and legality are the biggest concerns. The "PC ROMs" Landscape pc roms for windows