Shoot your computer. Else, shoot the guy who sold you your computer.
By the way, I`m Greek and I`ve been to that page and it all looks English to me!!
Anyway try to reset your computer`s file associations. You can install one of the apps below and when it asks if you want to reset file associations to the app you install, select Yes.
Media Player Classic
It is free and can be found here:
http://sourceforge.net/project/showfiles.php?group_id=82303&package_id=84358&release_id=403110
The file you want is named:
mpc2kxp6490.zip
If you want a program that is not freeware but you want it for free, download this app, read the NFO file using Notepad, and follow the instructions on how to use a serial generated by the included keygenerator.
BS Player Pro
http://rapidshare.de/files/18092546/cr-bs141.zip.html
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You can obtain a package of free 'codecs' (code/decode video viewing software) here.
http://www.free-codecs.com/download/K_Lite_Codec_Pack.htm
The pack you want is named:
K-Lite Codec Pack 2.72 Full, Standard and Basic - Update
If you want a codec pack that is not freeware but you want it for free, download this codec pack, run the keymaker, et voila.
DiVX Codec Create Pack retail:
http://rapidshare.de/files/21977856/D.rar.html