Using LCD screen question

[pianopipeman]

This is my first post. I have had my Raspberry Pi 3 for exactly two weeks. I have successfully installed NOOBS and all seems well on TV through HDMI.
With the RPI I was also given a 4" LCD for it, together with a software/driver CD.
My problem is, despite reading dozens of confusing Google entries, I cannot understand how to instal the driver to the Raspbian OS. The LCD lights up white but I am loathe to change too much on the SD for fear of corrupting it.
Really love the machine and hope someone can help me to get the LCD working .
Regards
ppm (Computing since Sinclair MK14)

[klricks]

Likely your software CD is not updated for the RPi 2 or 3.
What is the brand and model?
You need to contact the seller to see if there is an update.

[mthomason]

On the subject of corrupting the SD card - make a backup (for most OSes, the same imaging software used to make it can also copy it in reverse back to an image on a PC hard drive) , and go experiment to your heart's content. That's how we learn

[pianopipeman]

Thank you for your replies.
I still have not been able to use the LCD TouchScreen.
I have tried a number of image files - but without exception they have all failed to boot.
I've also tried uncompressing the various tar files which, although they create the LCD-show folder and files it still fails during the bootup. The last line reads 'end Kernel panic not syncing VFS: unable to mount root fs on unknown block (179,2)'
I don't know if the problem is with the software, the disk format or the LCD itself. I am running out of things to try.
Can anyone help or suggest things I might try?
Thanks