I tried to look for that option from system tools too but couldn't find it!
Try this till Broni comes,
1)Open Internet Explorer 7.
2)Choose Tools from the menu.
3)From the resulting drop-down menu, choose Manage Add-ons, followed by Enable or Disable Add-ons....
4)In the Manage Add-ons window, choose Add-ons that have been used by Internet Explorer from the Show: drop-down box.
5)The resulting list will show every add-on that Internet Explorer 7 has ever used. If an add-on is causing the problem you're troubleshooting, it will be one of the add-ons listed here.
6)Select the first add-on listed, then select the Disabled radio button in the Settings area at the bottom of the window, and click OK.
7)Click OK if prompted with a "For changes to take effect, you might need to restart Internet Explorer" message.
8)Close and then reopen Internet Explorer 7.
9)Test whatever activities in Internet Explorer were causing the problem you're troubleshooting here.
If the problem is not resolved, repeat Steps 1 through 7, disabling one more add-on at a time until your problem is resolved.