Let me add one more thing.
Instead of burning up one of your existing windows licenses... if you want to use the same OS as the factory recovery... then use the factory recovery via the tool below.
http://www-307.ibm.com/pc/support/site.wss/document.do?lndocid=TVAN-ADMIN#TBSA
Lenovo's Base Software Administrator works on XP and Vista Preloads... To understand how it works you need to understand how Lenovo's preloads were built.
Lenovo's Preloads are not static compressed images, but are modular images. There is intelligence built into the image deploy that uses not only PnP but machine model information from the bios to determine what drivers and apps get installed.
Think of it this way... A preload recovery for a Lenovo is actually an operating system install, driver install, and app/utility install that is just automated and that is why it takes so long. (IBM/Lenovo were doing modular images/installs before anyone else in the industry)
So... You run the Base Software Admin tool, and you are able to turn off all the installers for drivers, OS components, Utilities, thinkvantage tools, etc. Doing it this way gives you a system that is built with XP or Vista but is as virgin as you installing it yourself, except you end up with just the core drivers to update and perhaps the DVD authoring software that is so hard to find.
If any of you want to try that let me know... I could write a book on it.
(If any of the above sounds like a commercial it is because I was a sales engineer for Lenovo up until Mid-2010. Just trying to help

)