Hello Laura,
most comments which I know say, the best would be to copy all your photos into a directory (with corresponding subdirectories) by help of a file manager. From there LR should find all your photos.
Maybe these - from former LR versions - may help anyway:
http://help.adobe.com/it_IT/lightroom/using/WSE828B644-9097-46ab-98A7-E2719BBB6647.html
http://help.adobe.com/it_IT/lightroom/using/WSBED0E080-63AF-4ba4-ACCF-EC48C4F92D6D.html
And this (German advice) can help too (to translate shouldn't be a problem, or?)
Buona fortuna!
Hans-Günter