What is the difference between the windows 7 upgrade and Windows 7 Starter to home premium?

I have Windows Vista right now and want to upgrade and I saw both windows 7 and the windows 7 starter to home premium, but one is 30 dollars cheaper. Whats the difference between them?

The update is designed to turn Windows Vista into Windows 7. However you have to have the right upgrade version. You can only upgrade Vista Home to Win7 Home, Vista Pro to Win7 Pro, etc.

The Win7 Starter to Win7 Home Premium requires you to already have Win7 Starter install (not Vista). It then upgrades it to Win7 Home Premium. It will not work a Vista install.

Chain of Fools : Upgrading through every version of windows (HQ)

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