Windows cmd only uses Linux commands [migrated]

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http://stackoverflow.com – I'm using Windows 7 and for some weeks I can't use Windows commands (e.g. taskkill) anymore but Linux commands (e.g. ls, kill, ps,...) instead. The problem seems to be that it is not using my PATH environment variable anymore because it contains all necessary paths like "C:\Windows\system32" but it still says "command not found" for all programs contained in those folders. It must have something to do with my installed Cygwin which I did several months ago and which I'm updating regularly. Also I've installed the git bash, in which I can use Linux commands, too...could have something to do wi (HowTos)