> Desktop is in general less problematic when it comes to driver.
> Laptop is the main problem. It took me more than three days 
> to install Windows XP for a HP Compaq notebook since the 
> vendor only provides Vista driver.

If it is a Compaq branded laptop, just go to your dealer and ask for the
downgrade option to Windows XP. It comes with all needed drivers for XP.
Or just go to hp.com -> Download drivers and software. Everything is there
for W2K, XP, XP64, ...

Best Jens 

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