Game freezing when choosing top end configuration

Just downloaded the demo. Whenever i choose an option for Heads and valves(e.g. pushrod) the game freezes and the following error message comes up:


If you click OK another error message appears:


Clicking cancel closes the game, clicking retry closes the error message but the game remains frozen.

This is occurring on sandbox mode and in scenarios. I have tried reinstalling the game to no avail. Anyone know how to sort this?

Cheers,

Harry

You need to download and run the the automation cleaner from here first, before reinstalling: viewtopic.php?f=16&t=1271