No application for search and How add Agent Ransack to disk context?

When you right-click while on a folder in Windows Explorer, "search" isn't working. It complains that "This file does not have a program associated with it..." I presume I somehow clobbered something, somewhere. How do I get this working again?

In installed Agent Ransack for doing searches, and it works fine from the context menu (right click while in Windows Explorer) for ANY folder EXCEPT the top level disk... So, I can search "Program Files" just fine, but I can't search "c:"... The command doesn't show up in the context menu at the disk level. How do I add it?

Hello? Tap, tap, tap. Anybody?

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