S! All
I came across this utility while dealing with another issue not related to playing CoD.
This utility removes all traces of .NET Framework on your PC.
I suggest strongly that you read the readme.txt before using.

After using it you would then need to download and install the necessary .NET Framework installation(s)

The utility : http://blogs.msdn.com/cfs-file.ashx/..._5F00_tool.zip

.Net Famework 3.51 : http://www.microsoft.com/download/en...ng=en&id=25150

.NET Framework 4.0: Run from within Steam\SteamApps\common\IL-2 Sturmovik Cliffs of Dover\redist\DotNetFx40_Client

.NET Framework 4.5 : http://www.microsoft.com/en-us/downl....aspx?id=30653

.NET Framework 4.51 : http://www.microsoft.com/en-us/downl....aspx?id=40779

Plus, of course check Windows Update for any .NET patches\security fixes.

69th Steerpots