What Windows are you running................. ?

WINDOWS 98:
How about going to Internet Options and placing the address under the PRIVACY tab - (click on the edit button, bottom right) - add site address and then click block.

WINDOWS XP:
How about going to Internet Options and placing the address under the PRIVACY tab - (click on the site button) - add site address and then click block.

LoVe,
Rhapsody - (good luck)