Try lowering your Privacy settings in IE set it to allow all cookies, some sites have problems with that.
I am having problems using my Citibank account online. I'm having problems signing in. The page just refreshes and nothing happens. I cant make online payments. So far it just seems to be Citibank. I talked with them and they sent me though some stuff. They said it could be my router. I'm on cable and I set up a wireless conection for my brother. I bypassed the router and still no luck. I can go downstairs and use his computer and sign on with no problem. We are both running XP Pro SP1. Any thing I could check or do? Thanks.