Can't See my Yahoo Email or Install Yahoo Messenger?

I have an HP laptop with Windows XP, and since Wednesday I haven't been able to see my yahoo or hotmail. Whenever I go to the yahoo page, it loads, but when I click on mail, it comes up a white page. I tried to switch to clic mail, I can see how many emails I have, but when I click on a message I can't see nothing in the message, I cleared my cookies, my temp internet files, and did a spyware scan, even uninstalled yahoo messenger cause it all started when messenger kept coming up with script errors and I couldn't see ims coming through, now I can't reinstall messenger, and it didn't help the email problem.. Can anybody help out, please.. Thanks.