Problems sometimes when importing songs

[Dwdrake2]

First off I have made all the necessary changes to windows XP and have uploaded many disk into my data base.
My problem is I have manually up loaded a lot of disk but when I try to Import them into hoster I sometimes but not always get 0 songs uploaded. A good example was a party last night. The host of the party had 25 Chartbuster disk they wanted to sing from and I uploaded them a week before, checked them and all was good. The night of the party the songs were in the data base but I could not play them nor could they be found with the search feature. any ideas on whats happening here.
Thanks
D.Drake