Try a malware scan for starters. Check in Add/Remove first for anything suspect you
don't recognize as having installed yourself. Uninstall it/them, unless you're unsure.
Download, install and update MalwareBytes' anti-malware... run a scan..
Malwarebytes' Anti-Malware
P.S. Please go into your forum prefs and delete this header: Win 2003 Server password,
since it's irrelevant to your problem.
Blocking Unwanted Parasites with a Hosts File