Avoid mixing user-environment PATH and system-environment PATH

%PATH% expands to the system plus the user variables,
so if user defined user-environment PATH, 'setx /M PATH "%PATH%;..."'
mixes user-environment PATH and system-environment PATH.

bin/install.cmd

@@ -4,7 +4,10 @@ set NVM_HOME=%NVM_PATH%
 set NVM_SYMLINK=C:\Program Files\nodejs
 setx /M NVM_HOME "%NVM_HOME%"
 setx /M NVM_SYMLINK "%NVM_SYMLINK%"
-setx /M PATH "%PATH%;%NVM_HOME%;%NVM_SYMLINK%"
+
+for /f "skip=2 tokens=2,*" %%A in ('reg query "HKLM\System\CurrentControlSet\Control\Session Manager\Environment" /v Path 2^>nul') do (
+  setx /M PATH "%%B;%%NVM_HOME%%;%%NVM_SYMLINK%%"
+)
 
 if exist "%SYSTEMDRIVE%\Program Files (x86)\" (
 set SYS_ARCH=64