I have a weird computer in which you can NOT install
additional software except that
made by HumanWare, my computer's manufacturer. It's an expensive,
only visually impaired people like me know about.
It's called a
So... complain to HumanWare?
I don't know what kind of software runs there.
I first thought that you were running some Windows, in which case you
could use binaries that don't need "installation", like the ones on 
. There are also subversion clients that are "unzip & run".
Since you can't install software, are you sure you will be able to run
MediaWiki there? You will need at least a php interpreter, and a web
server (you could skip the db server if using SQLite backend).
It would also be possible to use a php script to ungzip an untar the
If you can't install software, installing mediawiki may not be too feasible.