what is the best method to pair xp with an existing win 7 on

what is the best method to pair xp with an existing win 7 on a laptop

Microsoft made this so people who have old apps that need XP could use this.

www.microsoft.com/windows/virtual-pc/download.aspx

There is also vmware player. Their website mentioned specifically how much better this is then XP Mode lol so...

www.vmware.com/products/player/

And then there is citrix.

www.citrix.com/English/ps2/products/prod...0&ntref=prod_top

If you like open source
www.virtualbox.org/

This does not actually answer your question, but there are some of the popular options.

If anyone has used these they can certainly chime in and tell us about how good or not good some of these are.