43b7af74_vices_List___Overclockers_Club__Notes
[Service Name] Indexing Service [Recommended Setting] Disable [Notes] 
This service is a big resource hog, mostly for the CPU and I/O operations of your hard drive(s). The "Indexing" service is suppose to speed up searches when you are trying to locate a file on your hard drive. I have found that it does more harm than good. I would disable it.
Windows XP Services Removal Guide » Page 2 - Windows Services List - Overclockers Club
Notes