If the laptop came with Windows Vista Home you can't really uninstall it. You will need to wipe out everything on the computer and use a Windows XP disk to load that on your computer.
Equipment needed -
1. Valid Copy of Windows XP
2. USB Floppy Drive w/ Disk
3. Windows XP Drivers
***Also be aware if you do this you will lose any of the programs that came with your computer if you wipe it out. I HIGHLY recommend making your Vista recovery CDs before attempting to install another OS. (You can do this from the Acer manager)
Note you may also need access to a USB Floppy drive and a floppy disk with the SATA drivers for your motherboard on it. ( If it has an Intel processor you can probably get it from intel.com, otherwise you'll have to track down the manufacturer of the motherboard)
I would also download all the Windows XP files from acer ( here
) as it will make you life easier later.
Now you'll need to insert the Windows XP disk and turn on the computer. It may ask you to press a key to boot from CD, go ahead and press a key if it asks this.
It will now start to install windows XP. During the first few seconds there will be a message that says "Press F6 to install 3rd party drivers" --- Go ahead and continue with the install. If you get to a screen that says there is no hard drive installed in the computer you'll need to reboot it and press F6 at this screen. Please have the floppy drive plugged into the computer but no floppy disk in it while the computer is rebooting. After you press F6 it is ok to insert the disk into the drive. It will continue to load for a few minutes and then give you the option to install the drivers you need for the computer to see your SATA hard drive.
After that mess it will ask you where you want to install windows too, and you'll want to have it do a quick format in NTFS. Screens and extra info can be found here.
When windows is done installing you'll want to pop the CD in with the drivers you've downloaded and install everything to get it back into working shape.
This is a fairly long and complicated process. If you have trouble you can pop in your recovery disks, reboot the computer and it will set the computer back to the way it came from the factory.