Don't be sorry for being french. ^^ Pas de probleme.
For the "00401707" error, uninstall the game, then re-install.
When you re-install, change the folder the game will be installed to. (Create a new folder here: C:\Games\ Then install the game there.)
Now you can use the English text patch, by placing "hadaka_en.exe" in the same folder where the game was installed. Then put 'msg.dat' and 'snr.dat' into the 'data' folder.
The last thing to do, is then the English GUI/Image Patch.