I suggest uninstalling Norton SystemWorks. I used it for some time and the chkdsk tool is really superior and doesn't add an unnecessary program to your system. In general, NSW is a tool designed to perform features which any user can already do with any XP install...and the redundancy can be a problem.
I have to ask...why do you run chkdsk at every boot?
If Windows does it (automatically), it's an indication that there may be file/hard drive problems...as previously suggested, I also recommend running a diagnostic of the hard drive (if such is the case).
Hard Drive Installation and Diagnostic Tools - http://www.bleepingcomputer.com/forums/t/28744/hard-drive-installation-and-diagnostic-tools/