Every second or so my disk access light on the pc flashes - Windows XP Premium SP1. I have tried every tool I can think of to try and find out why but I am at a loss. This is my fourth install and on the first 2 this didnt happen. I have switched off everything I can think of that may be causing this (prefetch, defender, indexing etc) bit it still goes on. Is there any way I can track down what is happening? Vista was installed 7 days ago.