Start by emptying your temporary cache, in Internet Explorer, tools, Internet
Options, delete files.
Check to be sure the Media control is enabled, in Internet Explorer, tools,
manage add-ons.
In the Show, expand to "Add-ons that have been used by Internet Explorer",
scroll down to Microsoft Office Template and Media Control." Enable the control
if it says disabled.
Add the Microsoft Office Online Web site to your list of trusted sites:
On the Tools menu in Internet Explorer, click Internet Options, and then click
the Security tab.
Click the Trusted Sites icon, and then click Sites.
Clear the Require server verification (https

for all sites in this zone check
box.
In the Add this Web site to the zone box, type
http://office.microsoft.com, and
then click Add.
Click OK twice.