DO you have a HAL? device, you can disable this in the webinterface http://linuxmce-ip/
then Automation -> Device status
click HAL, then click the check button Disabled, now SAVE.
Think the HAL is some light controll stuff, which atleast I dont have.
2^) For the nvidia drivers that's the _tricky_ part, but i've tried to write down my steps on how i did it in the "Why only vesa" Thread in this forum.
What graphics board do you have?
Feel free to stop re-installing, it's only matter of configuring it correctly :-)
Only problem with linuxMCE so far, it's not as plug and play as it is supposed to be, but i guess this just takes some time :-)