This game's installer isn't in English, what do I do?
Most Visual Novels translated via 3rd party patches will require you to install the raw Japanese version of the game before applying a patch. The layouts are often similar to their English counterparts so you should be able to guide yourself through it using context and familiarity.
Often the prompts will have an English abbreviation in parenthesis, ie (B): Back, (N): Next, and so on. If you get an error message, it may help to copy it (ctrl+c) and paste it into an online machine translation service.
In Windows 8/7/Vista, it is recommended to install games outside of the default Program Files (x86) folder, due to legacy issues with how 7 handles the Programs Files folders and how older games modify files within those folders.