how to keep your installation of winxp or vista when upgrade your os to win 7

what to do when,  you are moving to a new computer, or upgrading your existing PC to Windows 7

Zinstall XP7 will do the job, with a single click.

Security and stability:

With Zinstall, your new system is completely protected from any viruses and malware. No corrupt system files (DLLs, registry entries, drivers) are inserted into your new Windows 7. Zinstall completely preserves your system security and stability. No matter how many applications you had on the old Windows XP, your system remains clean and fast.

100% confidence:

Nothing is left behind - all your applications work on your new Windows 7 - exactly as they did before. Music, pictures, documents and all other files - everything is there. Zinstall preserves your entire old system.
Zinstall XP7 works with any Windows version (XP, Vista or 7), any edition (from Home Premium to Ultimate), and with 32-bit and 64-bit systems. Zinstall XP7 virtualization does not require Hardware-Assisted Virtualization to be supported by your computer.

Extreme ease of use:

You don't have to configure anything. Do you have a stand-alone PC? Maybe two PCs in a home network? Two hard drives? Windows installed on an external drive? No matter what it is, Zinstall is completely automatic and easy to use.

Feel at home:

Even if you are not yet familiar with Windows 7, you will still feel at home with it - right from the start. With a single click, you can instantly switch to your old, familiar Windows XP environment. Everything works, looks and feels exactly as your old computer - even the icons on the desktop are there. With Zinstall, you can adapt to Windows 7 gradually, at your own pace.

Successful migration guaranteed:

We are 100% sure about our product. That's why you only pay for it if your migration is fully successful - just like our customers from 53 countries all over the world, who already enjoy their new Windows 7 computers.