Textures invisible

Hello,

I've been playing minecraft for a while now (Vanilla, Feed The Beast and Tekkit) but all of the sudden all my textures for blocks, mobs and skins have gone invisible on every texture pack, in Vanilla, FTB and Tekkit. I tried copying all directory's and launchers from my laptop (where I still have textures), and reinstalling my java (both 32 and 64 bit) but without success.
Does anyone have experience with this kind of problem or a possible solution?

Thanks in advance