High-end graphics cards can push the game's frame rate past its engine limits, causing physics glitches. Use your graphics card control panel (NVIDIA Control Panel or AMD Radeon Software) to cap the game at 60 FPS for optimal stability. If you need help resolving a specific error, tell me:

Run the game installer or launcher as an Administrator. Right-click the executable file ( shift2.exe ), select Properties , go to the Compatibility tab, and check Run this program as an administrator . Getting the Most Out of Shift 2 on Modern PCs

If you encounter issues with your NFS Shift 2 serial number on PC, try the following:

NFS Shift 2 Unleashed has a strictly enforced (typically 5 machines). Locating your CD key in Steam | Ubisoft Help