Pues si te recomiendo que lo deshabilites, su función es indexar el contenido del disco para que al hora de realizar búsquedas, vaya mas rápido.
Si se te da bien el ingles leete esto a ver:
Indexing Service ~ ~ this service always has been a major resource hog. I NEVER recommend having this service enabled. Remove the function via 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) report to me that the Indexing Service sometimes starts up EVEN while the system is NOT idle... as in the middle of a game. You may feel, as I do, that this is unacceptable. If your computer suddenly seems "sluggish", this service is usually the cause of it.