Hi to all, I have a serious problem that Im dealing with. Every time I go for advice in PC shop I hear a lot of different answers(e.g intel is faster etc.). So i think that im at a right place to ask this and try to solve my problem. My budget is about 900euros.Thanks in advance

AutoDesk does publish MINIMUM system requirements for all their programs.  That's what you use as the basis for your system and build on it.I would recommend purchasing a 64-bit system running either Win7 or Win8 using the Professional version of Windows.  You'll want plenty of RAM (I think 16GB would be good) and a mid-range graphics card should suffice.  If you can afford it you might want  to include a solid state drive to store your OS and programs on and a second platter drive (spinning at 7200 rpm) for data storage.