Turn off automatic reboot at an error, and then post what the error you receive is.
To turn off auto-reboot on error:
Go to Start -> Control Panel -> System
Go to Advanced
Under the Startup and Recovery section, click Settings...
Under System Failure un-check "Automatically restart"
Also try installing the latest Nvidia drivers, any motherboard drivers and the latest version of Direct X.
Oh and which mode are you using with Rices plugin? OpenGL or D3D?