can not access a website i have been on before

Hi there, i am currently running on windows vista i am having trouble going on to a websites ive been on before (days ago) www.ttwebhosting.co.uk i can log onto them from another website so i know there is no problem at there end and ive looked through your forums but i not really sure what im doing, ive deleted all my cookies, web history and turned my firewall off, ive also tried to ping the website but that doesnt work either. Also ive noticed when i type this website into the address bar my google page comes up with other suggestions. can anyone help? Thanks x