DVD drive not working and help w/ video cardFollow

Recently reformatted, but now my DVD drive wont read DVD's. I put one in and it just loads like its doing the auto-run thing, forever. If I open a DVD playing program (windvd) or my computer and double click the icon, it freezes until I take the DVD out.
I remember I had this problem before when I first got the player, and all I had to do was download some program that fixed it, but I really cant remember ><
Oh, and Im not trying to watch a DVD, just install a game that is on a DVD.

oh, and I recently got a ASUS nvidea N6700GS video card. After upgrading, now my PC's %usage spikes up to 100% all the time. I believe it is a power source problem, as mine is only 300W. What would be a good wattage? Oh, and everytime I bott my PC, the video card resets, and I get a little icon that pops up and says that it has disable SLI because I dont have 2 cards ><. Any way to turn this off?

Thanks alot, having lots of problems lately, very frustrating.

Nah its an internal Samsung DVD-ROM SD-612

Under "my computer" its titled "CD-ROM drive" and not DVD drive, even though if I right click it it says its a DVD drive.