My favorite thing about Windows 7 Search...
...Is that even if you turn the option off, specify that it search no locations, and delete that index dbs, the service will still randomly start and churn away on your drive FNAR, it just won't store what it finds (as you've deleted the dbs).
To truly kill it, you have to disable the service, which will either vanish the search box on the Start Menu plus the upper right of Explorer hence making built-in searching impossible; OR it will have no obvious effect other than making search faster and more accurate than with the indexer running.