The OS is window 2000 pro. I download latest Netscape browser, it always shows similiar problem (but not the same number exception). I used Norton antivirus software (latest) and antispyware but doesn't help. I found related article (http://support.microsoft.com/kb/269400/en-us) in knowledge base on microsoft website. But it said it is fixed after version 5.0. I try to uninstall IE6.0 and reinstall it but no help. The problem happened yesterday. Any one know how to solve this problem? Many thanks in advance!