Hey, if your Acer is an Acer Aspire 4520, 5520 or 7520, ask me how to get a patched madwifi that'll make your wireless work natively, without Windows drivers.
Otherwise, go to the Applications menu --> Accessories --> Terminal. Enter the following, or copy the following code one line at a time and paste into your Terminal window. You can copy simply by dragging your mouse over text and highlighting it. Paste either by middle-clicking (clicking the mouse wheel), or clicking the left and right mouse buttons at the exact same time. It can take a little practice, but your new copy / paste ability will make the effort worthwhile.
Download the windows xp driver for the wireless card from the acer website (www.acer.com) to your Desktop.
echo blacklist ath_pci >> /etc/modprobe.d/blacklist
sed -i -r -e '/^# defoptions/s/$/ pci=assign-busses/' /boot/grub/menu.lst
apt-get install -y ndiswrapper-common ndiswrapper-utils-1.9
echo ndiswrapper >>/etc/modules
Unzip the driver by right-clicking it and choosing Extract Here.
Go back to your Terminal window. Enter the following commands:
If the output of "ls *.inf" indicates that there are no files with an extension inf, you might have to explore your extracted zip file until you find a directory containing the Windows drivers (and not just the Windows setup program for those drivers).
When you find where the INF file is located, "cd directoryname" to change to the directory containing it. Then enter the following command:
Restart your computer. After it's restarted, wireless should work.
sudo ndiswrapper -i net5211.inf