Hi guys, Im prettynew to all this (what IM doing atm at least)

Ive been trying to disassemble an exe-file wit win32disasembler (URsoft/tried another one first). My problem is that as soon as it has disassembled it seems to just close the disassembler. Kinda stopped my work there IS this some kind of security mechanism, or am I missing something?

Thanks in advance

win32disasembler that I know was already outdated in the late 1990's. I doubt I will even run in windows vista or windows 7. That may be the problem you are having.
Find Ida free edition in the hex-rays site. A little more complex to learn but up to date and much better.
On the othe hand, the disassembler included in Ollydbg 1.10 or 2 is quite good.