From what you said , it's seems a problem in binary files , maybe some corrupted files or virus .
In any case you can use the same 7zip packages version From
, to replace the old binary files .
Make sure to create backup of km folder
start by replace the ExE & dll in the Main km folder with new one from original km version ,then open and see if it repair the problem.
If not try replace the kplugin folder & open the prog.
The last step is to replace the components folder with the new one and keep in mind that some extensions put some files in components folder .
the other folder have script base files.
And you should know that:
>> your current profiles setting .
>> for extensions (xul) files (All script base files).
>> info about extensions installed .
>> macros files (script base files).
>> KM icons,toolbars.
>> extensions with binary base files .
>> default setting for pref, profiles ,menus and some extensions pref (All script base files).
components >> engine core files .
greprefs >> some global pref seting (script base files).
kplugins >> plugin binary files for km workspace .
modules >> some updates to engine files .
plugins >> plugin for browser (like flash ).
res >> resource for km basic look (images ,css,others).
You can move the green folders to any KM version and it will look Like The old one setting