Windows 8 upgrade paths
You can not upgrade from 32 bit to 64 bit
You can not upgrade cross language
Windows Developer Preview - Nothing, but if you do an install of Win8 without a format and you files will be located in a folder called Windows.old on the primary drive
System settings, personal files, and applications intact will remain intact.
Windows 7 Starter, Home Basic, or Home Premium can upgrade to Windows 8 (Standard).
Users running Windows 7 Starter, Home Basic, Home Premium, and Professional
Customers running Windows 7 Pro or Enterprise editions can update to Windows 8 Enterprise
Vista users without SP1 can upgrade to Windows 8, but only personal files will be preserved. Customers that do have SP1 will have their system settings transferred as well.
So the best thing to do is upgrade to service pack 1 and then upgrade if you wish to: You can download Service Packs form here.
XP users with SP3 can upgrade directly to Windows 8, but only personal files will be preserved (So its not really an upgrade).
So the best thing to do is upgrade to service pack 3 and then upgrade if you wish to: You can download Service Packs form here.
1 GHz processor
2 GB RAM
20 GB available hard disk space
1366 × 768 screen resolution
DirectX 9 graphics processor with WDDM driver
Internet access (fees may apply)
For touchscreen, you need a tablet or a monitor that supports multi-touch
Microsoft account required for some features
To access the Windows Store and to download and run apps, you need an active Internet connection and screen resolution of at least 1024 x 768
To snap apps, you need a screen resolution of at least 1366 x 768
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