Upgrader, if you've any ideas bring them on.
For now, try reinstalling Internet Explorer to see if this would do the trick. The following steps are for IE6 though, so there may be minor differences as you are using IE7.
- From the Start menu, select Search. If you're using the Windows XP Classic Start menu, then select For Files or Folders... .
- Click All files and folders. Select More Advanced Options and click to place a checkmark beside Search hidden files and folders.
- Ensure that Search system folders and Search subfolders are also checked.
- In the "All or part of the file name:" field, enter ie.inf .
- In the "Look in:" drop-down menu, select C: or the letter of the hard drive that contains the Windows folder. Then click the Search button.
- In the search results pane, right-click the ie.inf file located in the Windows\Inf folder and select Install.
- Reboot the computer when the file copy process is complete.
The instructions above are based on information from:
Repair Internet Explorer 6