My PC is a Dell Dimension 4100 and runs on Millennium Version 4.90.3000 Build 3000. System Model XPS-Z. I have a problem when I wish to defragment my hard disc. My computer is halted and a Norton Anti Virus message appears when I go into Dell Solution Centre to try and solve the problem myself. The message reads as follows: Norton Anti Virus High Risk. Malicious Script Detected. Your computer is halted and needs to do something about this scrips: Object: Filesystem object Astivity: Get special folder File: helpctr.exe. Has anyone else had this problem?