According to Microsoft, the ZR90 is compatible with Vista 32 and 64 bit:
https://www.microsoft.com/windows/compatibility/Details.aspx?type=Hardware&p=ZR90&v=Canon&uid=ZR90&pf=3&pi=7&c=Cameras%20%26%20Photo&sc=Camcorders&os=32-bit
Try clicking on "free download required" on the above page; it's probably the driver update.
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