Editor keeps reimporting the library

I´m recently installed unity pro 2.5 in a new machine (old one broke), but since then, after every action i do(save a script, change import settings for assets etc.) it tries to rebuild the the whole library(or at least a big part of it, because it takes a lot of time). Also, it gives a few warnings saying that some of my classes are not valid types, which makes me believe it isn´t building the library properly.

Anybody had this problem yet? Should i install any software(i.e.:Java or directX). Project deadline is monday and being one computer down is pain enough, so if i could get some help ASAP it would be deeply appreciated.

Thanks in advance guys, i know you will get me out of this one

 

Install Unity 2.6
That should help

 

I´d rather not switch versions so close to the deadline. Will do if there´s no other answer.