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I've installed MiKTeX 2.9, but the problem persists. Do I have to do something in BaKoMa as well?

Thank you

I'm sorry. I'm working in Windows 7 with BaKoMa TeX 7.85 with MiKTeX 2.8 as back-end. I'm using this:
\documentclass[twocolumn,prd,aps,groupedaddress,nopacs,nofootinbib]{revtex4}
\renewcommand{\topfraction}{0.9}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{latexsym}
\usepackage{graphicx ...

Hi there!

I'm beginning with LaTeX, using BaKoMa TeX.

Several times I try to use packages and it does not work! All document vanish and the only thing I can do is to take out the lines with \usepackage. Now is cite, can't use it. Why this happens?

Thank you