No LOR entry in boot menù

Hello,

I have pushed LOR 2013 to 5 client PCs using management solution 2013, 2 on the PC work correctly, the other 3 don't have the LOR 2013 boot option in the boot menù. The LOR hidden folder is there in the c: unit, but no boot option. Maybe the pc got automatically rebooted before completing the installation, because they were brand new windows 8 pc and had a lot of updates/software pushed in the first day.

How may I fix this?