Together with bug reports please attach an archive of Documents and Settings/user_name/Application Data/Comodo folder contents.
It contains your configuration files and logs. If we have these files chances we can resolve the issue quickly are significantly increased.
Also, if Comodo Online Backup displays an error and asks to send error report to developers, please allow it to do it Such reports are also very helpful.
Can you please send me the archive of Documents and Settings/user_name/Application Data/Comodo folder contents (e.g. via PM) so that we can investigate/resolve the problem?
Specified folder contains your configuration files and logs.
First, please double check if password you are entering is correct. Please note that passwords are case sensitive so make sure that CAPS LOCK is not on, and that keyboard is working in same mode you used to enter password (e.g. in English not Russian).
Second, are you able to log in with your login/password to Comodo Account Manager? If not, try to request new password using “Forgot password” link on that page.