babelmiktextexniccenter
At an earlier time babel package is functioning normally. But now, when compiling tex files, MikTeX asked to install the babel package, even after it's installed again and again.
The required file
tex\latex\babel-english\english.ldf
is missing. It is a part of the following package:
babel-english
I use TeXnicCenter editor.
MiKTeX and TeXnicCenter are two different things. The former is a distribution of TeX that includes a bunch of packages as well as the executables latex.exe, pdflatex.exe, tex.exe, etc. The latter is an editor that provides a front end to the distribution. You should point TeXnicCenter to where you installed MiKTeX, not TeXnicCenter itself.
On my machine, running TeXnicCenter on Windows 7 with TeX Live 2011 (yet another distribution of TeX), my setup looks like this:
These building profiles (I have a bunch of them, as you can see from the list on the left) are set up when you first start TeXnicCenter. The "Path to the (La)TeX compiler" is the location of latex.exe on your machine. Depending on where you installed MiKTeX, that's where latex.exe resides. I'm guessing it would be somewhere in:
C:\Program Files\MiKTeX\2.9\bin\
or
C:\Program Files (x86)\MiKTeX\2.9\bin\
depending on whether you installed a 64-bit version of 2.9.
Edit: I may be wrong in my path assumption above. @doncherry has pointed out that this may in fact be
C:\Program Files (x86)\MiKTeX 2.9\miktex\bin\
Goes to show the installation structure of different installation may be noticeably different.
The best practice to install MiKTeX, TeXnicCenter and Adobe or better SumatraPDF do the following:
fancyhdr.sty!)To install new packages to MiKTeX please do only use the MiKTeX package manager for that, this program is desiged to do adding packages for you. You can choose the new needed packages from a list of available packages ...
Best Answer
Now babel language definition files are independent of the main babel installation (it's a change between version 3.8 and version 3.9). So probably
babel-englishis not installed, and you have to install it with MiKTeX Package Manager.