if an upgrade does not success, restore your backup. the current upgrade issue is severe, as user accounts have not been migrated successfully.

I assume, that the issue is caused by an incompatible collation of the server - while the database has SQL_Latin1_General_CP1_CI_AS (where CI means case insensitive), the server might have a different collation for the temp table, that is used for the maigration.

I comparer an Install version of the 4.5.3 software and a upgrade version. There are some additional files in the install version in the C:\DonNetNuke453_Install\Install\Module directory that are missing in my installation. Are they important?

Announcements_03.04.00_Install.resources
Blog_3.02.00_Install.resources
Documents_03.01.06_Install.resources
Events_03.03.07_Install.resources
FAQs_04.04.00_Install.resources
Feedback_04.04.01_Install.resources
Forum_03.20.09_Install.resources
Help_03.00.01_Install.resources
HTML_04.05.00_Install.zip
IFrame_03.02.03_Install.resources
Links_03.03.07_Install.zip
Media_03.02.03_Install.resources
NewsFeeds_03.01.01_Install.resources
Reports_04.05.02_Install.resources
Repository_03.01.10_Install.resources
Survey_04.00.85_Install.resources
UserDefinedTable_03.03.06_Install.resources
UsersOnline_03.01.00_Install.resources
Wiki_04.00.01_Install.resources
XML_04.03.04_Install.resources

Hi I had exaclty the same problem with my upgrade: text/HTML editor was broken or "toast" ;)

to fix the html editor alone grab the 4.4.0 insatllation zip and in it you'll find the html module .zip upgrade file.

In that zip is an updated version of the html ascx file - simply copy that up over teh top of the one in the desktop modules/html folder.

hope this helps

rgds