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uses
 tlhelp32;

procedure GetProcessList(const aProcessList: TStrings);
var
  Snap: THandle;
  ProcessE: TProcessEntry32;
begin
  aProcessList.Clear;
  Snap := CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
  try
    ProcessE.dwSize := SizeOf(ProcessE);
    if Process32First(Snap, ProcessE) then
      Repeat
        aProcessList.Add(ProcessE.szExeFile);
      Until not Process32Next(Snap, ProcessE)
    else
      RaiseLastOSError;
  finally
    CloseHandle(Snap);
  end;
end;