Hello. maybe you can try this thing:

-try to download and install the latest version of shockwave, http://get.adobe.com/shockwave/

-or you can try to make a new account and see if you can get into a Xat chat that way.

-try other browser. here are links where you can download them:
http://www.firefox.com/
http://www.opera.com/
http://www.apple.com/Safari
http://www.google.com/chrome/

-Go back to your regular user account for your computer. Open up Internet Explorer and click on 'Tools', then after clicking on 'Tools' click on 'Delete Browsing History'. When the 'Delete Browsing History' window pops up, click the 'Delete all' button.

hope this helps. goodluck!