If you installed the customized(!) version of Windows that ACER supplies with each new ACER computer, namely Windows Vista Home Premium, you should have all of the correct device-drivers.
If you "down-graded" from that version of Windows to Windows XP, and some of the device-drivers are "missing", then I recommend that you reinstall Windows Vista, or purchase an "upgrade" to Windows 7.
You might try to access the manufacturer's web-site, via:
http://www.Acer.com
to see if they support "down-grading" to Windows XP, and if they supply the needed device-drivers.
But, your BEST solution is to reinstall Windows Vista, and be sure to apply "Service Pack 2" to Vista, to bring it up-to-date.
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