there are 6 if you include vista starter and enterprise.
I would guess around nine.
You do need a Windows Vista key code to reinstall Windows Vista. CNET is a great technology resource to use in looking up product information. This site will offer information on price, performance and rating for Windows Vista.
Yes, there is an update for Windows Vista in the ipod. It is available from the Microsoft windows site. They have numerous free upgrades available for many different programs and devices.
Windows have gone through many versions. They include Windows 3.1 95 98 98SE ME NT 2000 XP Vista Soon to be released Version 7
All versions of Windows would be used in Canada, like in any country. Many people would be using Windows 8. Many would still be using Windows 7, many using Vista, many using XP and so on.
There have been thousands of versions of Windows API. Different versions have been released with each new Windows operating system and during the course of it's lifetime, each edition is subjected to many hundreds of updates.
They are "compatible" in the sense that many applications that run on Windows XP will run on Windows Vista.
Many applications and games written for or compatible with Windows 98 will run on Windows Vista.
It depends on the version. 32-bit Windows supports up to 4GB of RAM, whereas 64-bit versions support 4GB + of RAM. It is the same with Windows Vista and 7.
No. Due to the length of time between the releases of Windows XP and Windows Vista, as well as Windows Vista ditching support for some legacy technologies, there are many devices that will not function in Windows Vista but work in Windows XP.
No. Windows 9x is a term used to describe the DOS-based operating systems Windows 95 and Windows 98, similar versions of Microsoft Windows which were produced in the 1990s. Occasionally, Windows Me is also included in the term, as it is very similar in many respects.
Many consumers are happy with Windows Vista, so yes.