You must uninstall and reinstall The Sims, then reinstall House Party. If you have The Sims, Livin' Large and House Party then you have to uninstall and reinstall The Sims, then reinstall Livin' Large and finally reinstall House Party.

If neither correct the problem, download the House Party install fixer. Before installing The Sims House Party, run the install fixer.

This is NOT a game patch, and should NOT be used if your game is functioning properly, and should NOT be used if The Sims House Party is installed. It simply allows the installation process to continue in cases where a technical problem has prevented proper installation.

Download Install Fixer (360 Kb)