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Dear Johannes_B,
The problem was solved, it was a file corruption in the MixTeX engine.
Thank you, your advice was a clue.
Afshin

Hi,
I would be thankful if someone can help. My problem is with margins.
This is my code (generated automatically by "TexStudio"):
\documentclass[10pt,a4paper]{article}
\usepackage[latin1]{inputenc}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{graphicx}
\usepackage ...