I would assume that your problem and this problem -
http://www.eukhost.com/forums/f10/kingair-down-4832/ - are one and the same.
Although there was temporary data loss, as confirmed in the thread linked to above, the reported effects (also explained in the thread above) were only temporary and any data that had been reported as missing had reappeared.
Have you opened a support ticket regarding this issue? Are the files / updates still not present?
Hope that helps
.