Well download Firefox from the link in my signature or go to www.mozilla.com and get the newest one which should be what is there.
It will allow you to get online but you will probably not be able to get the updates from Microsoft with it.
You can go HERE
to download IE8 and following the instructions I gave before just put it on a flash drive or on a cd and then run the setup on your system. That should get you the correct IE and be able to get the SP2 and SP3 installed on your system. I would suggest after installing IE that you go to Microsoft's windows update page and get all the Critical updates
first/ This will get your system completely up to date.
Then after that get Avast to protect you from infections. Make sure to update and register it since it is free for a year.
Let me know if there are any other questions I can answer for you then.