MelissaBUbear,
Looking at Apples website I saw that iTunes 8.0.2 is the latest version they have available for Windows Vista X64 as a download. In order to get a different version or find out what is the better version in your case please contact Apple as they might have an archive of other iTunes versions available for you. To go to Apple's support page please click on the link below.
Using Third Party Software, including hardware drivers can cause serious problems that may prevent your computer from booting properly. Microsoft cannot guarantee that any problems resulting from the use of Third Party Software can be solved. Using Third Party Software is at your own risk.. ****
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Carlos
Microsoft Answers Support Engineer
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