How do I fix "WinPcap will not install" problem?

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I had a problem today that seems to be an old one - WinPcap won't install because an older version is running - WinPcap install is aborted. I tried the solutions on the old Blog without success. By the way, I run Windows 7, 64 bits.

I also run another program that uses an older version of WinPcap. I uninstalled it but I still ran into the same WinPcap install error. Trying to install WireShark using its own installer would produce the WinPcap-is-already-installed error consistently, in spite of no sign of another WinPcap version.

Bill K