Has it always been this way or did it just start?
You didn't mention any kind of malware protection. If the system is not clean all bets are off.
http://www.computerhope.com/cgi-bin/yabb/YaBB.cgi?num=1149948530 If everything is fine try this;
1. Start
2. Settings
3. Control Panel
4. Internet Options
5. Security tab
6. Reset all 4 security zones to Default
1. Start
2. Settings
3. Control Panel
4. Internet Options
5. Privacy
6. Restore 1 Default button
1. Start
2. Settings
3. Control Panel
4. Internet Options
5. Advanced
6. Restore 1 Default button
You may need to do the following as well
1. Start
2. Settings
3. Control Panel
4. Internet Options
5. General tab
6. Remove cookies, temporary files and history
Kudos to Raptor and Fed.