During installation of iTunes I got a message: "The cabinet file ApplicationSupport.cab required by this application is corrupt and cannot be used."
What should I do? Please help!
The easiest way is to stop the installation procedure and obtain a fresh package with the software. This way you will avoid any corruptions regarding installation.
Please delete your installation package and install a new one. Also, make sure you don't use download accelerators as these tools sometimes corrupt the packages.