Thank you for your help. I will try to answer your questions.
What error messages (if any) are displayed when the system is restarted?
no Error Messages are Displayed
Does the shut-down still occur when you have the latest ATI graphics drivers installed?
Yes latest Drivers are installed
Does the shut-down always occur at the same event in LSW3 ?
not shure It did happen on two levels (genonois and ventress lvl 1)
Does the system shut down if you leave another title (such as LSW Complete Saga ) sitting idle overnight?
No this is the first game this occures
I system is an INTEL Quad Core Processor. I did connect the LEGOStarwars.exe Process to only one of the four processors (via the Task Manager)
After that the shutdown didnt happen.
after playing for a while the game dosnt only crash, but it truns of the whoule PC system in a shutdown.
I lowerd the resulution but it didnt help.
I do not have these trouble playing other games such as LEGO SW 1 or LEGO SW complete edtion.
I have a VISTA system and a ATI Radeon 4800.
To bad Yodas HelpDesk isnt yet updated for the PC version...