Go through your FTP access and just rename those folders to something else (as a backup), like
1com_comment or something.
Then retry install.
The problem here is that the installation is trying to create these folders, and they already exist since it's upgrading.
Renaming is just a precaution, in case something goes wrong.
I assume you have correct PHP and SQL stuff running?
Sorry, not sure about that plugin.
I have it installed, but not sure what it does. Probably something really important...
Perhaps the big boys can answer that better...