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booktabs is compatible with tabularx.
The *.fd files should go in the same place as the *. sty files, inside the latex folder. For a general guideline about what/where to put files you may read the TeX Directory Structure document.

I'm trying to install some fonts (cbgreek-full). In the documentation it tells me to… Which documentation? The MikTeX help says to
For example, follow these steps if you want to add an entry for the font map file xyz.map: Run initexmf --edit-config-file updmap .
Insert the following line at the ...

Ted wrote:

Stefan_K wrote:use \cline

The booktabs package is a nice alternative too.

Strongly suggest the booktab package too.

Eenzc wrote:I don't understand where to apply this, putting it below \cline{4-9} does nothing.

The preamble of your document will be a nice spot for that command.