I don't believe the Startup Repair will resolve this issue.
Click on the Start orb
and then type cmd
in the Search programs and files
In the pane above the search box Programs will appear with cmd below it, right click on cmd and select Run as administrator.
If you are prompted for an administrator password or for a confirmation, enter the password, or click Allow.
When the Elevated Command Prompt has opened copy and paste each of the commands below followed by Pressing Enter for each command.
regsvr32 /i mshtml.dll
Type in exit and press Enter.
Restart your computer and see if you can make changes in the User Account.