Thanksguys.
Find the path, erased them and started with a new catalog from scratch.
Once the catalog was created and the system start to create the previews, I chosen standard previews, seems to take a long time.
Already over 24hs for a total of about 90,000 images, most of them Raw files.
Is that a longer time than it should take? Looks like it will need just another few hours looking at the progress bar.
Is that telling me that my computer is running out of muscle and need to be upgraded to run Lightroom eficiently?
Hugo