My original question was: How to improve rendering
The answer that seems suitable to my cause is to install cm-super. I did that (using package manager [winxp 32 bit, MikTex installation 2.9 recently updated]). But still the command
\usepackage{cm-super}
yields an error.
User H Cavendish suggested to run updmap-sys, but I am not sure about how to do that on WinXP.
2011 November 04 edit:
I made it sure that I have installed 'cm-super' - but still get the same error:

I have also tried updating the file name databases - but no avail.
cm-superINSTALL is pretty clear on how to installcm-super. Did you follow the instructions for MiKTeX correctly? – Werner Nov 03 '11 at 23:42