check this one out...a clean and easy way to understand
Code:
*www.lifehacker.com/software/top/windows-vista-beta-how-to-dual-boot-windows-xp-and-windows-vista-179906.php
u can install windows vista and windows xp , !
Windows Vista Upgrade Advisor beta
Want to see if your Windows XP-based PC can run Windows Vista? Just download, install, and run the Windows Vista Upgrade Advisor beta.
This small software tool will scan your computer and create an easy-to-understand report of all known system and device compatibility issues, and recommend ways to resolve them. The Upgrade Advisor can also help you choose the edition of Windows Vista that best fits the way you want to use your computer.
download this advisor and test ur pc is capable of running vista or not,its not any spyware !
Code:
*www.microsoft.com/windowsvista/getready/upgradeadvisor/default.mspx