|It's possible if Acer has all the XP drivers for your model. You will need a licensed XP disk, if you have a sata hdd it will need drivers on floppy to enable it. |
If no floppy drives, you will need to slip stream drivers onto a XP cd.
All data and programs will be lost in the process.
Acer support will be lost.
Much easier to learn to use Vista.