Microsoft has released the official fix for the ANI mouse curser vulnerability. You can get it via Microsoft Updates at http://update.microsoft.com -- just look for the KB925902 critical update. If you have Automatic Updates turned on, you should get the fix at a random time during the next few days. Personally I would not wait for that - this is that serious an issue.
Information about the release schedule: http://blogs.technet.com/msrc/archive/2007/04/03/ms07-017-released.aspx
And the relevant Microsoft Security Bulletin with manual links to download the patch for network deployment for all platforms: http://www.microsoft.com/technet/security/Bulletin/MS07-017.mspx
If you installed the eEye 3rd party patch last week, see this post for details on what you should do before installing the MS patch.