Default login filed.

I am download last 2.2.2 version. In process install I enter default admin user and password. (I exactly sure what i entered. I repeate several times.) After modx is installed I can not login with user are enterd in installation. What is problem? How to solve a problem or work around it?

You have a several options, you could re upload and reinstall, you could just upload the setup directory and rerun setup or you might want to try following the directions here to reset the password (though this will require some work and may not be worth it at this stage): http://rtfm.modx.com/display/revolution20/Resetting+a+User+Password+Manually#ResettingaUserPasswordManually-ResettingPasswordinMODX2.1

Are there any errors or are you just getting authentication errors on submission of the password? if you aren't getting erros but can't login I'd opt to reupload all the files and reinstall as there may be files missing. One other thing to look at would be permissions on the server that might restrict the functionality of the application, this should in some cases throw errors but not always.

Finally, check out Bob Ray's reference on Troubleshooting MODX: http://bobsguides.com/modx-troubleshooting.html