could be your culprit if it's been turned on without your knowledge or by accident. Try this....
TURN OFF CONTENT ADVISOR:
If you have forgotten the Content Advisor password or if you want to disable it completely after a password has been entered, you can delete it by browsing to this folder in regedit.exe (remember to backup your registry first):
Go to Start\RUN, type REGEDIT and then click the plus marks in front of the following:
Now click the word RATINGS and select the icon called Key in the right-hand pane and press delete. Close Regedit.
Open Internet Explorer and click Tools/Internet Options, Content tab, click Disable. When prompted for a password, don't enter anything, just click OK. This will disable Content Advisor.
A message keeps popping up that says, "PLEASE CHECK YOUR CONTENT ADVISOR SETTINGS FOR MISSING INFORMATION".
For that particular Content Advisor issue, this is the solution:
You get this message in Internet Explorer:
Content Advisor configuration information is missing. Someone may have tried to tamper with it. You may wish to check the Content Advisor settings.
Once you click on the OK button, the Internet Explorer can no longer bring up any web sites.
This happens when the ratings system has been enabled and the ratings.pol file is missing or damaged.
To fix this, do the following:
1) Exit out of Internet Explorer.
2) Go to the Start button, Programs, Windows Explorer. Go to the C:\WINDOWS\SYSTEM folder. Look for the file named Ratings.pol and rename it to Ratings.old.
NOTE: You might need to set Windows Explorer to view all files. To do this, go to the View pulldown menu, click on Options, click on the View tab, select Show All Files, and click the OK button.
3) Double click on the Internet icon to open Internet Explorer.
4) Click on the View pulldown menu, click on Options, click on the Security tab.
5) If the button in the Content Advisor area says "Disable Ratings" click on it and enter the Supervisor password (if you DO NOT have a password, just click on the OK button without entering a password). The button should now read "Enable Ratings."
6) Click on the OK button. Close out of Internet Explorer and restart it by double clicking on the Internet icon. You should now be able to bring up web sites.
NOTE: Uninstalling and reinstalling Internet Explorer does not resolve this problem.