@tarrat if you still have the same issue and need help in the future make sure to inform your OS, which version of utorrent you're running, if the files are on SSD or HDD. If your upload is smaller than 8GB you don't even need to create a torrent, you can hash it directly from the upload page.

@tarrat generally the client will calculate the piece size automatically based on the selected files, to optimize distribution. But if you're failing to hash it, you can try setting a higher piece size manually, like 8 or 16 MB. If it still fails to hash, you can check if your Windows is managing a swap file on its own, if it has a fixed size or if swap file is disabled altogether.