Quick little suggestion - try upgrading to a higher version of IE or download Mozilla Firefox (for free).
If you do not currently have Internet Explorer 7/8, you may want to upgrade to a newer version, preferably 8. If you do already have version 8, try downloading Mozilla Firefox and do your internet browsing with that rather than IE. Firefox is actually safer than Internet Explorer; it's a bit better at blocking malware from invading your computer, and it's a lot faster with the loading processes.
Upgrade to Internet Explorer 8: http://www.microsoft.com/windows/internet-...er/default.aspx
Download Mozilla Firefox:http://www.mozilla.com/en-US/firefox/personal.html
(On this page, scroll down to the very bottom of the page and look to the right; you will see a little icon with the back of a fox circling a globe; next to it will say "Upgrade Your Firefox"; click the green "Download Now - Free" button below.)
About the audio problem:
Look around in your settings and control panel for a bit, see if you can find anything on audio or why your audio may be shut off. If not, try to contact a help and support center; it's probably nothing anyone can fix by showing you what to do over the internet.