Crysis Warhead Patch 1.1 is now available, it includes the original patch and also has a hotfix included for several minor issue including the changing of resolution in Windows Vista. THIS IS A HOTFIX.
These are the full patch notes as seen in the readme file with the patch.
* Windows Vista: Mouse cursor should no longer have an offset in the menu.
* Windows Vista: Unrequested launches in windowed mode should occur less often now.
* Timedemo can now be started from the command line.
* Better dynamic texture support for enthusiast mode.
* This fixes a known issue with changing resolution in Windows Vista
* Other Minor Bug Fixes
* Added 64-bit executables for Windows XP x64 and Windows Vista 64-bit version. In Windows XP x64 a new shortcut will be placed under the Crysis Warhead program group. In Windows Vista right-click the Crysis Warhead icon in Game Explorer and choose to run the game in 64-bit mode.
* Games saved in 32-bit won't work properly when running the 64-bit version and vice-versa.
The de-authorisation tool was also made available earlier in the week. If you would like to download that, please go to the Warhead news section of MyCrysis.com