Git does not change the working directory

Question

I use Windows 10. Before installing git 2.6.1.windows.1, I installed git 1.9.5.github.0(by installing GitHub Desktop), it works fine. But when I installed git 2.6.1.windows.1(from git-scm.com ), I can no longer use git:

• The powershell console displays [(unknown)]instead [master], even when I changed the working directory to my project, it still displays[(unknown)]

• When I git add(or git commit, git push), he told me a mistake:fatal: Not a git repository: 'C:\Program Files\Git'

After that, I will return to the old version of git - git 1.9.5.github.0but the error is still there.

I think git has not changed the working directory, I have no idea. Now I can not work with git.

How to fix it?

EDIT 1:

Again, this is not the first time I use git, I never forget cd myproject. However, although I switched to the project, git "thought" it worked in C:\Program Files\Gitand did not "understand" that the working directory was changed! What's the problem, Like the title: Git does not change the working directory

EDIT 2:

When Get-Command gitin powershell, it returns:

CommandType      Name         Version      Source
-----------      ----         -------      ------
Application      git.exe      2.6.0.0      C:\Program Files\Git\cmd\git.exe

EDIT 3:

@EdwardThomson asked me to withdraw git config --listandGet-ChildItem Env:

• Output git config --list: http://pastebin.com/qUxKnBiT

• Output Get-ChildItem Env: http://pastebin.com/ShPcypF0

DECIDE:

, GIT_DIR, , ! - GIT_DIR, GIT_DIR , git , , git

, .

Answer 1

, .git().