DiskCryptor error. Can it be fixed? or what equivalent disc encryption software should be installed?

DiskCryptor is giving me the error: "Not enough space after partitions to install bootloader. Install bootloader to first HDD track?". Then after clicking YES, I get "Error code: 20" then upon clicking Okay it just returns to the main DiskCryptor screen without mounting or encrypting the C drive(containing Windows).

So can this be fixed? or what equivalent disc encryption software should be installed? Thanks