Something strange happened to my pc last week. Can't access Internet Explorer without the above message appearing and blocking access. At same time Norton Virus scan started and Outlook Express was hijacked by Yahoo! Only my account affected thankfully. Have read some other recent threads and tried to set back to pre trouble days by System Restore but it won't restore it for me and the error message still comes back. Bit afraid to tamper in case we lose access on the other accounts. Checked logs, etc. to see could I find the source but don't find anything too unusual. Any ideas thanks!