So i'm in this drow city to obtain the dragon eggs, i've done a few tasks and now i have to meet with these two drow in sowtheast. If i go there and I try to speak to them it tells me that they have nothing to tell me. Where is the problem?

Do you have the latest patch? And do you have the Baldurdash Fixpack?
If not, there are links in "Forum Guidelines And FAQ" sticky post.

Are you on assigment to intercept a beholder ?
And what exactly do they say.. appears busy or has nothing to say to you ?

yes, it's the one with the beholder, it sais has nothing to say

what does the bladurash fixpack do?

i didn't find the link in the forum guidelines, but i think i do have the patch anyway

Baldurdash fixes many bugs that official patch doesn't.

What do you mean "you cannot find the link"? Go to the second post in the guidelines thread, you will see big FAQ there. The first subtitle is the one you seek.

What operative system do you have?