While doing the steps below, make sure you run as admin, if needed.
Step 1: Delete all TPC files (except the installer and cab files, obviously)
Step 2: Clean your registry files (I use C-Cleaner, it's free and pretty good)
Step 3: Install newest version via the .exe
Step 4: Make sure your screen supports 800x600 resolution
Step 5: Run the game in compatibility mode for win xp (sp3) or win 98.