Every time booting up error message (laptop)?

I had the Discord program on my laptop and I still had the installation file on my desktop.

I accidentally clicked on it, even though the program was already installed and since then I have received an error message every time the laptop is started that Discord can't be installed. I already uninstalled Discord, but it didn't work.

When starting Discord or the installation file? If installation file, then just delete it.

When starting from the laptop. I have already deleted the installation file and Discord.