Game Won't Start, Or Not Working.

[Pancho]

Hi, I got the same problem as DJames757 and toyota-martin.
My computer data: Dual Core 2.53GHz, Vista SP2, 4MB RAM, ATI HD4850 (512MB).
I tried to install "HotFix" but I can´t. The message "The setup has detected that no version of RigNRoll is installed. The update requires a previous version of the game to be installed. Setup cannot continue".
Well, RigNRoll occupies 8GB of disk space so I guess it is installed. I tried to install the HotFix from the original installed directory but no chance. I installed the game twice, I updated all drivers, I tried to start the game as administrator. The result remains the same: the logo pops up and then nothing. Can anybody help me?