Indexing Service ~ this service always has been a major resource hog. I NEVER recommend having this service enabled. Remove the function by the "Add / Remove Programs" icon in the control panel (Windows Setup Programs). It uses about 500 K to 2 MB in an idle state, not to mention the amount of memory and CPU resources it takes to INDEX the drives. I have had people (and witnessed it on other people's computers) document to me that the Indexing Service sometimes starts up EVEN while the system is NOT idle… as in the midst of a game. You may feel, as I do, that this is unacceptable. If your computer suddenly seems "sluggish", Indexing Service is usually the cause of it.
Solution.
Type SERVICES.MSC in the Run dialog box, find the Indexing Service in your list, right click it, select Properties, and then in the Startup Type field, select Disabled. Restart the computer and it will stay disabled.
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cisvc.exe