[Tex/LaTex] Some troubles with the font

font-encodingsfontspdftex

I've just noticed, that after rendering if I zoom the text then it look like a low quality text (look at the screen). I've heard that I can install cm-super package. I put \usepackage{cm-super} to the preamble but get an error "cm-super.sty not found". Before If I didn't have any package latex suggested me to install it right in the latex so I didn't have to visit any websites or something. Am I supposed to install it manually?
Anyway, how can I solve the problem?
I have two files in my project: latex file and .sty file. Here's how the preambles look:

  1. In the main file: 

    \documentclass[10pt, a4paper]{article}
\usepackage[utf8]{inputenc}
\usepackage[T2A]{fontenc}
\usepackage[english, russian]{babel}
\usepackage{Lections_style}

    1. In the lections style: 

        \RequirePackage{amsfonts}
  \RequirePackage{amsmath}
  \RequirePackage{amssymb}
  \RequirePackage{graphicx}
  \RequirePackage{babel,blindtext}
  \RequirePackage{subfigure}
  \RequirePackage{hyperref}
  \RequirePackage{fancyhdr}
  \RequirePackage{cite}
  \RequirePackage{amsthm}
  \RequirePackage{xparse}
  \RequirePackage{mathabx}
  \RequirePackage{array}
  \RequirePackage{tabularx}
  \RequirePackage{multirow}
  \RequirePackage{makecell}

There're already 55 pages typed so I would be very glad if there's any solution without a lot of pain. Thank you and sorry for my English.

I've been asked to give a MWE, so here it is: 

   \documentclass[10pt, a4paper]{article} 
   \usepackage[utf8]{inputenc} 
    \usepackage[T2A]{fontenc} 
    \usepackage[english, russian]{babel} 
    \begin{document} Проверка текста. 
    \end{document}

enter image description here

Best Answer

From the start menu launch MiKTeX Package Manager, select mathabx-type1, right-click on the selection and select install. base.

To install cm-super, do the same from MPM.

Finally run from the command-line: updmap --verbose to update the type 1 fonts database.

enter image description here

Added: I forgot this (important) detail: for the mathabx fonts to be displayed with their type 1 versions, as there is no .fd file, add this to your preamble:

 \DeclareFontShape{U}{matha}{m}{n}{
 <-6> matha5 <6-7> matha6 <7-8> matha7
 <8-9> matha8 <9-10> matha9
 <10-12> matha10 <12-> matha12
 }{}

and do the same for mathb and mathx if you want to use them.

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