The exact same thing happened to me, so I decided to look up on the subject and found that you can receive your windows defender updates by going to start menu and clicking Windows Update, which will automatically check to see if there are any updates for your computer if there aren't it will say so. That will help for right now.

 

I am trying to look up on the subject.

I just found out whats happening, At least whats happening on my computer. Click tools in the IE7 menu click Internet options then click the programs tab then click Set Programs then click Set Your Default Programs thhen click Internet Explorer and click set this program as default.

 

I hope that helps.

thanks but it didn't do anything

Well thats what a Microsoft professinal technichian told me to do, It worked for me.

 

Sorry it didn't work.