I cannot open Libreoffice at all. I’ve been using it for about three months with no problem.
Without the exact error message(s), we can’t help you.
What is a problem? You can’t open a LibreOffice or you can open it, but when document is opened you get some error? Please post the error message and also operating system name and version. Also exact LibreOffice version from Help | About menu. More info, better the answer can be.
I also have this problem. I cannot open libre office or my document files, the error message states:-"The system cannot find the file specified. This is on a Dell lap top running a windows vista home premium system package (English version)
Because so little info, I can only speculate. Maybe your LibreOffice profile got broken somehow. I suggest to rename a profile to see if this is true: https://wiki.documentfoundation.org/UserProfile