hello i have a 8600m gt now it started overheating like crazy from the last 2 months my laptop is 9 months old. what can i do please tell me?

should i get a notebook cooler? i am still under wrty.
but i need to use my laptop everyday i dont have a desktop or any secondary laptop.

If i contact acer now what will they do will they replace my 8600m gt with a new 8600m gt? but that will be the same problem right? even if they replace to 9500m gs.

Or Will they send me a new laptop? plz tell what will they do to reapir?

Also Another problem is i replaced my optical drive in my laptop and in doing so i lost a screw will it void my wrty? will i be able to claim wrty?

plz reply soon