Don't worry carlee i was also facing such kind of issue where i was not able to open Yahoo at my place, but i had find the solution for it, for that you need go to C:\WINDOWS\system32\drivers\etc over there click on hosts and then click on open option, then it will ask you to open with, open it in notepad then copy paste the following at the end and finally save the file and reboot your system for changes to get effected.
Please copy and paste everything below and post in a reply.
127.0.0.1 localhost
If you see the following lines, remove them and save the document.
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