Email websites not working

Hello,

I've been having this problem for the last couple of days with my laptop. It would open any website I want both in Firefox and IE, except for hotmail, gmail and facebook!!

I first thought it was a problem with my home connection, so I tried from my work connection and it still didn't go away. It's not a problem with my accounts either, because I can open them (hotmail, gmail and facebook) on other computers just fine.

I really need to fix this!! It's driving me nutts.