after reinstalling a web backup, I lost virtuemart pictures in front & back end

[radvla]

I had to reinstalled the web in joomla that includes a virtuemart shop from a backup.

All the web has been restored ,except the pictures of virtuemart in the front and back-end.

I checked the images directory and the images are there.
Some kind of configuration that stablish the relation beteween tables and pictures must have lost in the reinstallation.

I need help.

Can anybody help me?