Familiar website now unavailable

I have a my bank’s website that I frequent to download my account information. Suddenly, when I go to the address there is an error page. I have talked to the bank and the site works from there office. I can reach the site from my work but not from home. I have also talked to my ISP and they can not decipher why only this site is no longer available to my computer. I need this site to download financial transactions and now it is the only site that I can not reach. I do not have a firewall and I have Windows XP and Internet Explorer 6.0 Cipher 128-bit. Please help!

Thank you!