I have Light Room Classic installed but it will not open. I have already uninstalled and installed again and will not open. No error message pops up. What can I do for it to open?

Unfortunately you haven't given us any information about your system. Therefore, all proposed solutions are a look into the crystal ball.

Do you like to start with Lightroom and have done a new clean installation and create a new catalog?

Or do you have install Lightroom as an update over an existing installtion with an existing catalog?

Which operating system do you use?