I don't see that you list whether you are using Firefox or Internet Explorer. Are you using an old version?
First, try clearing your cookies/ temporary Internet Files and see if that works.
Did you make any changes at all? Did you add a Firewall program or anything?
Your Flash Player may be corrupt. Do you receive any prompts or warnings?
You may want to update your Java-
http://java.com/en/download/index.jsp
NOTE: If you do update your Java, be sure and delete the old versions/upgrades of Java.
If you come to this site, can you open up photo albums and view photos?