Having a different issue? If the game crashes after the logo screen, you likely need the "NFS Undercover 1.0.1.18" patch to fix the dual-core CPU bug. That’s a different "hot" problem for another article.
If you are stuck on the Need for Speed: Undercover registration screen, . The system meant to check it is simply extinct.
Certain mods can redefine the heat level system to make police chases more meaningful or difficult by altering how quickly heat builds and how the police respond.