This page got indexed on Google and is a high result when searching for "ie7 full screen". I'd imagine that this post is getting so many views because it's an issue being encountered by multiple people who are looking for a resolution. So let's see if we can find a resolution for all the users looking for a solution and not delete the post. Also just as a side note I deleted posts on this thread about its high hit count simply to clean it up.
If you're a user experiencing this issue also please let us know if any of the suggested resolutions work so we can have a positive resolution to this issue.
1. Press Alt to display and/or hide the file menu that is auto-hidden by default. If this menu is being displayed after pressing the alt key you'll be unable to go full screen.
2. I was unable to duplicate this issue on any of the computers here including the computers running Windows Vista. So my first recommendation would be to make sure you disable and/or remove any add-ons or extra tool bars you have running on Internet Explorer. It's very likely older tool bars and search bars may not be compatible with the new IE 7 and are causing the issue.
Toolbars can be temporarily disabled by clicking Tools, Toolbars and unchecking extra Toolbars installed (by default Status is the only toolbar checked). Additionally you can often completely uninstall a toolbar through the Add/Remove programs in the Control Panel.
Additionally updating all installed toolbars is also a good recommendation.
3. Make sure to scan the computer for any additional spyware that may have been present on the computer before Internet Explorer 7 was installed on the computer. I recommend Windows Defender for those users who don't have it it can be found at:
http://www.microsoft.com/athome/security/spyware/software/default.mspx4. Read that several users with SiteHound (Site Hound) have been encountering this issue. If this program is installed try seeing if any updates are available, if not try uninstalling it to see if it resolves your issue.
5. Try
this utility suggested by CBMatt in
this post.