The 2006 release wasn't built for Windows 10 or 11, so you’ll likely need these community-made mods to make it playable:
Look for used DVD-ROMs on sites like eBay or Amazon . These are the most "official" way to own the game. Download Need for Speed ​​Carbon PC Game 2006
A popular mod that unlocks hidden settings, enables windowed mode, and fixes stability issues. The 2006 release wasn't built for Windows 10
By ThirteenAG. This allows the game to run at 1080p or 4K resolutions and fixes the aspect ratio so the UI isn't stretched. enables windowed mode
Because it is "end-of-life" software, many fans turn to archival sites. Ensure you use a reputable source to avoid malware. Essential Fixes for Modern PCs