upgrading from 98se

I recently aquired a hp pavillion6740c that I would like to upgrade to xp home for my daughter so she will have her own computer . When I went to the product page on the HP site "http://h10025.www1.hp.com/ewfrf/wc/prodinfoCategory?lc=en&lang=en&cc=us&dlc=en&product=61009&"
I noticed that it says that this product is not upgradable to windows xp. I tried a search to see if I could find the reason but was unable to come up with any other information on the subject.
Does anyone know the reason that this computer supposedly will not upgrade to XP? It is maxed out with 500mg's ram and the celeron processor is plenty pwerfull enough to do so, leaving me at a loss to understand why the mfg. would say that it is not upgradable.
Thanks for any help on the subject.
I could always give it a shot but if it is not doable I would rather spend my energy restoring the original 98se system to it's pristeen condition than be on a fools mission for hours.
Thanks Again; KennJ

Description of the Windows XP Upgrade Advisor
http://support.microsoft.com/kb/307726/en-us

MORE INFORMATION
The Windows XP Upgrade Advisor provides information about potential problems your computer may experience if you upgrade to Windows XP. The Windows XP Upgrade Advisor checks the system peripherals and programs and generates a list of items that may not function correctly with Windows XP.

The Windows XP Upgrade Advisor report lists compatibility issues that were found in the following two major categories:

The most likely reason is a lack of WinXP drivers for some of the hardware. But Windows 2000 drivers will often work perfectly in WinXP, so it might be worth having a go at installing XP, especially as there are a lot more drivers around these days.

The CPU might be the holdup, but I've seen stripped-down installs of XP on slower systems. Maybe one of the experts will check your system specs and give an informed opinion.