When I first boot my pc I find I often have to wait several minutes before the hard drive stops churning away, before Windows becomes responsive enough to actually use. On further investigation (Task Manager processes list) I see that a process called "ccsvchst.exe" is reading several hundred million I/O Read Bytes. I looked on Google and apparently this process is part of Norton software. I've been using Norton Internet Security for a few years, and have found it necessary in recent years to switch on "Silent Mode" as soon as Windows finishes booting up, otherwise the machine is unusable as Norton churns the hard drive constantly. However, during the last few months even switching to silent mode does not stop ccsvchst.exe from churning away at the hard drive apparently for no good reason. Admittedly, my machine is old now (Pentium 4 with 512MB RAM running WinXP Home SP3), but all I use it for is surfing the web, using email, and tinkering around with programming stuff. This is getting really annoying now. I even tried to kill off the ccsvchst.exe process using Task Manager, but got an "Access denied" message.