Your question makes no sense.
1. Yes 2. C language has no versions. 3. See the attached link.
You don't. The only way to change the base language in Windows (start button, menus etc) is to reinstall windows with a disk in the language you require.
Windows 95 version C was the last version to be released - on 26th November 1997. It ceased to be supported as of 1st January 2002.
Microsoft Windows is mainly programmed in C++ and C.
No. The bulk of the Windows operating system is written in C++.
Yes. C is a general purpose programming language with compilers available for all versions of Windows.
C
C, C++, and C#
The C language is a universal language that is available for most computers. The language was created in the early 1970s long before either Mac or Windows computers were available.
Microsoft Windows Was Created By Using C, C++, Visual BASIC
C, C++, C# I think.
C programming language