[Blackpool] Help please... anyone?

[Elizabeth C]

I have a laptop - E-System EI3103

I brought home the SanDisk pen drive with Lubuntu OS on it - wanted to replace Ubuntu OS with Lubuntu OS (1st attempt to install an OS).

Message on screen = 

Error: No configuration file found

No DEFAULT or UI configuration directive found!

If I reboot normally, Ubuntu loads and the pen drive is visible in the icons.  I can open it and 3 files are there - when I click install nothing happens.

Enlightenment required please if anyone feels generous - it would be much appreciated.

Many thanks

Elizabeth