I bought Skyrim today, and everything is going great, having a great time, except for a few bugs I can't seem to fix.
The first one is that my game seems to lack fire and ice effects, for example, I can't see the fire trail when I use my fire spell (I can see the lightning trail, tough) I can't see dragons throwing fire or ice at me (I can only hear it), and for example, in the Riverwoord Trader, the fireplace is lit, I can see the smoke trail, but there's no fire and no light coming from it. This happens pretty much around all of Skyrim.
But here's the strange thing, my brother, playing the same game, through the same Steam account, in the same computer (only diffrence is he logs in through his own Windows account), doesn't have any of these problems.

The second one is that sometimes the zone I'm in gets shadows all over the place, like if an eclipse was happening, and there's weird lines everywhere in the ground... This happens mainly during the daytime, during the night it almost never happens. Sorry, I can't really explain it more in detail, English isn't my native language. I can't really understand if it's a shadow problem or a texture problem. This problem, however, is also shared by my brother.
I already did a quick search and the only solution people seemed to have was updating my drivers, but they are all up to date...

If anyone could help, I would be much apprecited.