Good news!!! I've found a solution to solve the problem (just for .torrent files, I don't know if it works for another file types too).
1. Go to C:\Program Files\BitComet
2. Copy "torrent" folder to another folder (e.g. to root directory)
3. Uninstall BitComet
4. Remove BitComet folder include subfolder within
5. If You wish, restart windows (optional, I did it... you may pass it)
6. Reinstall BitComet
7. Copy "torrent" folder to C:\Program Files\BitComet\
8. Go to C:\Program Files\BitComet\torrent
9. Open .torrent files or You may drag into BitComet's window
10. Redirect destination file to last folder where you store it.
It works!!! All downloaded files will be resumed at the last state, not from begin.
I hope it helps you all
Best regards.