Files in BitComet disappear, what should I do? URGENT

bghippo

Since my computer has something wrong, I need to start the computer again, but all the files in BitComet disappeared, but I can still see them in my hard drive (but not yet completed).
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% y) `9 n; Z  AThen I went to re-download again, it would start from 0%.  What should I do?  How can I put them from hard drive into Bitcomet to continue downloading and not from the beginning 0%?
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Thanks.