Upgrading to Windows7
Upgrading to Windows7Many previous versions of Windows require a clean installation of Windows 7 instead of an upgrade. If you need to do a clean installation of Windows 7, you'll need to copy all your personal files to an external drive before you install Windows 7, and reinstall all your Adobe applications afterward. If you do need to reinstall your Adobe applications, you may be required to activate them. This won’t count as an additional activation as long as you installed the software on the same hardware as before. Use the below matrix to determine if you need to perform a clean Windows 7 install, and to reinstall your Adobe applications. If you have questions about the matrix, or the Windows 7 installation, please contact Microsoft.
Legend
X = in-place Upgrade is not supported. Clean install of Windows 7 is
required.
x86 - "x86 to x86" in-place Upgrade is supported.
x64 = "x64 to x64" in-place Upgrade is supported.
RIU = Repair In-place Upgrade is supported. This is a CSS/PSS scenario whereby
the customer performs a "Win7 SKU" to "Win7 same SKU"
In-place Upgrade i.e. "Win7 Ultimate" to "Win7 Ultimate" as
a means of repair.
RIUx86 = Repair In-place Upgrade is supported for x86 only.
WAU = Windows Anytime Upgrade is supported. WAU uses the Transmogrifier platform
to transform a lower Win7 SKU into a higher Win7 SKU i.e. "Win7 Home
Basic" to "Win7 Ultimate".
| Upgrade to: | Windows 7 | |||||
| Starter | Home Basic | Home Premium | Professional | Enterprise | Ultimate | |
| Upgrade from: | ||||||
| Windows 95, 98, ME, NT4, 2000, XP | X | X | X | X | X | X |
| Windows Vista (RTM) | X | X | X | X | X | X |
| Windows Vista Starter (SP1, SP2) | X | X | X | X | X | X |
| Windows Vista Home Basic (SP1, SP2) | X | x86, x64 | x86, x64 | X | X | x86, x64 |
| Windows Vista Home Premium (SP1, SP2) | X | X | x86, x64 | X | X | x86, x64 |
| Windows Vista Business (SP1, SP2) | X | X | X | x86, x64 | x86, x64 | x86, x64 |
| Windows Vista Enterprise (SP1, SP2) | X | X | X | X | x86, x64 | X |
| Windows Vista Ultimate (SP1, SP2) | X | X | X | X | X | x86, x64 |
| Windows Vista Home Basic N (SP1, SP2) | X | X | X | X | X | X |
| Windows Vista Business N (SP1, SP2) | X | X | X | X | X | X |
| Windows 7 Starter | RIUx86 | X | WAU, X | WAU, X | X | WAU, X |
| Windows 7 Home Basic | X | RIU | WAU, X | WAU, X | X | WAU, X |
| Windows 7 Home Premium | X | X | RIU | WAU, X | X | WAU, X |
| Windows 7 Professional | X | X | X | RIU | X | WAU, X |
| Windows 7 Enterprise | X | X | X | X | RIU | X |
| Windows 7 Ultimate | X | X | X | X | X | RIU |
snipped from: http://kb2.adobe.com/cps/508/cpsid_50853.html#matrix