可能，这不是正确的名字。

在我的系统上，它是VLC媒体播放器（ 32位），但是也找不到它。

我做的是使用调试器：

Probably, it's not the right name.
On my system, it's "VLC media player (32 bit)", but that doesn't find it either.
What I did was use the debugger:

Process[] pname = Process.GetProcesses();

快速查看列表给了我：

And a quick look through the list gave me:

Process[] pname = Process.GetProcessesByName("vlc");
if (pname.Length > 0)
    {
    MessageBox.Show("Process Running");
    }
else
    {
    MessageBox.Show("Process Not running");
    }

给出正确的消息框。