Here's a solution.
(if u're on Vista) Type "run" then press enter.
(if u're on XP) just click on "run".
Type "regedit" and press "Enter"
Navigate till you get to Domain in :
Right click on Domains, and delete the whole folder.
Only problem is, all your other restricted sites will now be gone from the restriction list. If you're using SpyBot, just open SpyBot and re-immunize, and they'll all come back. If you've added them manually and deleted the Domains folder before reading THIS, then u went to New York (you went n f**d urself). You'll have to add them manually, so if SpyBot didn't create that restriction list, u'll have to re-add them manually from the IE's Tools > Internet Options > Security > Restricted Sites (select it, then click on "Sites" right below it) then add whatever u want to add.