My windows vista laptop is quite slow on the internet so what can i do to make it faster?

I have vista and want to make yahoo my default email. I tried under tools, internet options,programs. But there is no email option.

I have an ACER ASPIRE T671. It had windows vista installed to it but then i decided to reformat it to windows XP. When the installation finished. I clicked on the internet icon to see if it worked but no. It said “The page could not be displayed” so i went to check the network connections and i found “1394 connection”. Can anyone please tell me what is wrong and how i can fix it.

On my computer there is two hard drives the vista hard drive is almost full where as the data has only a small use. Basically what is the difference?
Okay.. So can i like move music and things onto data without like screwing things up ?