Vždyť v těch hláškách je napsáno, co je způsobuje. 
http://forums.afterdawn.com/thread_view.cfm/259820
Disable "Nero Scout"
Restart XP
CTL-ALT-DEL (click on "processes" and insure no process with nm** is running)
Go to Program Files\Common Files\Ahead\Lib and rename NMIndexStoreSvr.exe to NMIndexStoreSvr.bak (or any non used extension)