itunes keeps crashing vista

Trying to put iTunes on my Vista puter. Installer keeps crashing. Any idea why?
When it crashes it says it needs quicktime. That is already on the puter. I have tried reinstalling quicktime but that goes down as well
iTunes is a digital media player application, introduced by Apple Inc. on January 8, 2001 at the Macworld Expo in San Francisco,[2] for playing and organizing digital music and video files. The program is also an interface to manage the contents on Apple’s popular iPod digital media players as well as the iPhone. Additionally, iTunes can connect to the iTunes Store via the internet to purchase and download digital music, music videos, television shows, iPod games, audiobooks, various podcasts, feature length films (available only in the USA), Movie Rentals and Ringtones.
iTunes is available as a free download for Mac OS X, Windows Vista, and Windows XP from Apple’s website. It is also bundled with all Macs, and some HP and Dell computers. Older versions are available for Mac OS 9, OS X 10.0-10.2, and Windows 2000. Although Apple do not produce iTunes for other operating systems, it can be run on Linux through Wine.[3]
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