安装我的msi时如何确保devenv.exe没有运行

I am writing a VSPackage for Visual Studio 2008, and am deploying it with a WiX generated Msi. As the end of the install, I am running "devenv.exe /setup" as required to get VS to notice my package. However, this command will not succeed if there are any copies of Visual Studio running.I am writing a VSPackage for Visual Studio 2008