How to repair TW:M2 classic (vanilla) grand campaign ?

[mr.floppy]

After installing bunch of different mods to my Medieval 2 copy (inc. Third Age, Broken Crescent, Sicilian Vespers,Deus Lo Vult), Grand Campaign ceased working.
When I start .NET error appears (with details below), however I am able to continue and start the game. But after choosing grand campaign I received error something about cannot choose item. I've found some descr_strat.txt file on the net, but now after choosing a faction(I have only 5 factions to choose : Denmark, Milan, Egypt ..) tt takes me back to main menu.
I do not want to reinstall Medieval 2 as I have plenty of mods i do not wish to reinstall them, as long as kingdoms and patches and so on.
Can you help me, advise which files can be potentially broken, and best - send them to me ?
I think proper vanilla descr_strat.txt would be welcome for a start... Thank you.

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.NET Error:

See the end of this message for details on invoking
just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************
System.FormatException: Input string was not in a correct format.
at System.Number.ParseDouble(String s, NumberStyles style, NumberFormatInfo info)
at System.Double.Parse(String s, NumberStyles style, IFormatProvider provider)
at System.Convert.ToDouble(String value, IFormatProvider provider)
at System.String.System.IConvertible.ToDouble(IFormatProvider provider)
at System.Convert.ToDouble(Object value)

[stoogeofstooges]

Put this in the technical help section, you'll get better responses.