MegaDudeZX

I'm planning the first option. But for now it's too late for that. I will response if that worked. Thanks for your help!

Well I tried that now and after about 7 1/2 minutes my laptop... turned itself off. So it seems like that but vanilla Minecraft even with some mods runs perfectly. Well nothing I can do there. Great, just when it ran out of guarantee... How I hate these preparations of products.

When I play with the Tekkit Pack (haven't tried any other yet) everything runs normally. But as time passes it seems like white stripes from the bottom (hotbar probably) going up to the screen appear. A few seconds later it instantly crashes and close itself. I can't explain it to myself... Hope you know something about this problem.