|Assuming these for a business & assuming none of your staff is familiar with Linux, why did you you buy them in the 1st place? There are plenty of laptops, notebooks, or netbooks available that run Windows. And netbooks generally aren't a good choice to do any type of "work".|
As Jolicloud stated, you should get a USB optical drive to do the installation(s). And since these netbooks have SATA HDDs, you will have to compile a new XP disc with the SATA drivers slipstreamed into it. You will also have to locate all the necessary drivers for the motherboard chipset, graphics, audio, network, wireless, bluetooth, etc. I just checked the Acer site & no XP drivers are available for the D270, so you will have to hunt them down individually. Once you find the drivers, they can also be slipstreamed into the new disc. What about SP3 & IE8? They can be slipstreamed in as well.
Once you compile the new disc, it can be used to install XP on all your Netbooks. And since you have 5 of them, you will need 5 XP licenses. The Linux patitions will need to be completely wiped out & the HDD repartitioned & reformatted. I recommend at least 2 partitions - one for Windows, one for data storage. Once you get the 1st one figured out, the rest should be easy, but you have a fair amount of work ahead of you.