If you are finally taking the plunge and upgrading your older copies of windows, you ablsultely need to know what version you have. Upgrading to windows 7 may not work at all in your scenarion and once you have purchased Windows 7, it is likely you cannot take it back as most retailers discourage software returnss to help thwart piracy.
Read the "Unsupported Upgrade Scenarios" below:
Upgrades to Windows 7 from the following operating systems are not supported:
- Windows 95, Windows 98, Windows Millennium Edition, Windows XP, Windows Vista® RTM, Windows Vista Starter, Windows 7 M3, Windows 7 Beta, Windows 7 RC, or Windows 7 IDS
- Windows NT® Server 4.0, Windows 2000 Server, Windows Server® 2003, Windows Server 2008, or Windows Server 2008 R2
- Cross-architecture upgrades (x86 to x64) are not supported.
- Cross-language upgrades (en-us to de-de) are not supported.
- Cross-SKU upgrades (for example, Windows 7 N to Windows 7 K) are not supported.
- Upgrades from Windows Vista to Windows N, Windows K, Windows KN, or Windows E are not supported.
- Cross-build type upgrades (fre to chk) are not supported.
- Pre-release upgrades across milestones (for example, Windows 7 RC to Windows 7 RTM) are not supported.
Supported Windows 7 Upgrade Scenarios
| From Windows Vista (SP1, SP2) | Upgrade to Windows 7 |
| Business | Professional, Enterprise, Ultimate |
| Enterprise | Enterprise |
| Home Basic | Home Basic, Home Premium, Ultimate |
| Home Premium | Home Premium, Ultimate |
| Ultimate | Ultimate |
From Windows 7 | Upgrade to Windows 7 |
| Enterprise | Enterprise |
| Home Basic | Home Basic |
| Home Premium | Home Premium |
| Professional | Professional |
| Starter (x86 only) | Starter (x86) |
| Ultimate | Ultimate |
From Windows 7 | Anytime Upgrade to Windows 7 |
| Home Basic | Home Premium, Professional, Ultimate |
| Home Premium | Professional, Ultimate |
| Professional | Ultimate |
| Starter | Home Premium, Professional, Ultimate |
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