Mozilla Firefox Not Responding (Windows Vista)

[237SJ]

Every time I go on to my Google home page on Mozilla Firefox, I get a not responding message. I have to wait about 30 seconds for it to work. I can switch sites when typing in the address bar but as soon as I go back to the home page, I have to wait again. It`s a real pain because it means I can`t do anything quickly. I haven`t changed anything. I tried uninstalling and reinstalling Mozilla but it hasn`t made any difference. I haven`t added any plug ins or add ons or anthing. Has anyone any idea why this is? (It doesn`t happen with IE)