Do you mean a reboot or a reformat of your computer. There's a big difference. A reformat will delete all items. A reboot is simply restarting the computer. Try to find the location of your previous downld folder which I presume is called Shared. Use your search engine. Once found, make a note of the location & directory path. Then change LW's downld location to that one. Type the path into Tools>Options>Saving box & press Apply.

However, if you rebooted whilst LW was still open, then your downld preferences might have become corrupted in which case your older incomplete files will be useless.