Blocking Internet Explorer from Automatically Upgrading Via Windows Update
You have a few options for doing this especially if you are using something like WSUS. However if you aren’t, then a registry change via group policy or logon script is probably the best option. Here is a a registry file that will block automatic upgrade to internet explorer 8 and 9:
Windows Registry Editor Version 5.00
If you are only interested in blocking one version of internet explorer then just remove the appropriate lines. To use group policy to deploy the registry settings you need a method to apply the reg file. I tend to use the following VBS script:
Copy the text into a text file with the extension .vbs and attach this to a logon group policy in the usual way.