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The following table shows which editions of Windows Vista can be upgraded to Windows 7.

What's upgrading from Windows XP?

1. Run Windows Upgrade Advisor (windows.microsoft.com/upgradeadvisor) to see if there are any known issues that might affect the installation and whether you should install the 32 or 64 bit version of Windows 7.

2. Save your files and settings on an external hard drive using Windows Easy Transfer (windows.microsoft.com/windows-easy-transfer). If you don't have an external hard drive you won't be able to use Windows Easy Transfer. Alternatively, you can copy files you want to keep on a USB flash drive, CDs, or DVDs.

3. You'll need to manually reinstall your programs, such as Microsoft Office, after you install Windows 7. Gather the installation discs for your programs and any associated product/license keys. You might be able to download some programs from the Internet. For example, Windows Live Messenger can be installed from download.live.com/messenger.

4. Inset the Windows 7 DVD into your PC. When asked "Which type of installation do you want? click "Custom (advanced)."

5. After Windows 7 is installed, use Windows Easy Transfer to restore your files and settings.

If you're not comfortable installing Windows 7 yourself, check with a local retail store or PC services company to see if they offer upgrade services.

Some quesions:

(1) Can I use a retail (RTM) version of the full-blown Win 7 Pro (or Ultimate ) SP1 64-bit to do the upgrade?

Yes, you can depending on the version/architecture of Windows you currently have installed, read the additional responses to learn more.

(2) Can I use a reatil version of the Upgrade Win 7 Pro (or Ultimate ) SP1 64-bit to do the upgrade?

Yes, you can, depending on the edition/architecture of Windows you have installed now. in place upgrades can only be done from Windows Vista. If you are running Windows XP, you have to do a custom clean install.

(3) Now - how about (for both question and question  if the version was NOT SP1, but just 64-bit vanilla?

The RTM or integrated with SP1 can do in place upgrades.

If you have any questions, please feel free to contact me:

Full version of Windows 7 Professional suitable for upgrade or clean install.

1. - Installation files (both 32bit and 64bit version)
2. - OEM product key that works with both 32bit and 64bit version
3. - Free tech support with installation/upgrade process.
4. - Activation guaranteed or your money back.

This product key can be used to activate existing non-genuine copy of Windows 7 Professional.

Windows 7 Professional supports almost all computers ranging from old Pentium 4 to the newest i7 always providing the same familiar user interface.

Minimal system requirements: 1Ghz processor, 1GB RAM, 25GB free space. 
Windows 7 Professional can upgrade Business edition of Vista.

When upgrading Vista please use upgrade advisor to check your system compatibility.