I too have this problem. I ran installed comodo on my lenovo desktop and the backup worked without a hitch, yet I just installed it on my brand new HP desktop and I too got the code 4 error. I proceeded to uninstall it, install it again, and it gave me the same error. I ran it as a scheduled backup and again the same error. I created a folder and again the same error. Please let me know how to rectify this situation because I am really happy with the product.