Find the game's executable file shortcut. Right click the file and go to "Properties". Then in the "Shortcut" tab, type -console 1 (with the space) at the very end of the "Target" text box. Make sure this is typed outside the quotes. When you do this, the console command will appear when you use that shortcut to start the game. It will also show up each time when the game starts up to the menu screen. Then while playing the game, press ~ and type one of the following codes to activate the corresponding cheat function. Press [Enter] or click "Submit" to activate the code. Note: Commands entered at the console will auto-complete while you type them -- just type any letter, and you can scroll up and down with the cursor keys to view the various available console commands. Click the "X" in the corner or press ~ to exit the command window.
Read more: http://www.cheatcc.com/pc/vampiretmb.html#ixzz3IB7j7VHA
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