If you're having trouble installing the Live Meeting client, try using Live Meeting Web Access instead.
Go back to your Meeting Entry Page (check your email for the invitation if you don't have the Entry Page open).
Click Accept Terms and Use Live Meeting Web Access near the bottom of the page.
If you want more information about installing the Live Meeting Client, see System Requirements For Live Meeting Client.
Microsoft Live Meeting 2007 is no longer available for purchase. Consider using Office 365 for your organization.