troubleshooting

My antivirus says dqxclarity is a virus

When you download and extract dqxclarity, your antivirus might trigger and flag the program as a virus. This is a false positive and can be ignored, but you may need to make an exception in your antivirus to mark the executable as OK. I recommend making an exception to the entire dqxclarity folder. The reason this program is flagged is because it's an unsigned executable that changes frequently. Signing an executable from a trusted certificate authority costs real money per year (in the range of $70-$500 USD) and as this is a hobby project, it isn't worth the price to the developer.

I extracted the zip and the dqxclarity.exe program disappeared (or isn't there)

Your antivirus is removing dqxclarity from your computer. I'd suggest adding an exclusion to your entire dqxclarity folder in this case. If you use something other than Windows Security, you will need to Google how to add an exclusion/exception using that software.

When I launch dqxclarity, the game dialog is translated, but all of the menus are still in Japanese

Make sure you clicked "Patch Game Files" in the "Game" tab before launching the game. This downloads two custom files that are placed in your game folder, which is what enables all of the in-game menus to be translated.

If you're still seeing the menus in Japanese, note that every time the game patches, it overwrites the modded files. You will need to re-download them by clicking the "Patch Game Files" button again.