ignore the ones in temp folders, it's the permanent cookies you need to look at. If you want to spend the time, you can go through them manually, and just by looking at them see which are worth keeping and which to bin (just keep the ones for sites where you visit regularly, and want to log in automatically). The only reason for having cookies in temp folders is that they are copies of cookies in permanent folders, so deleting them achieves nothing
for this exercise though, you need to delete ALL ybw cookies from windows/cookies folder