Hi Morgan,
Please first check whether your webcam works as stand alone device or not( by stand alone i mean whether it works without yahoo msgr or not)
After that check whther your webcam works with other messengers like SKYPE and GOOLE TALK messengers or not.
Most probably you may need the Webcam driver softwarefor your acer, for that you can contact Acer.Acer technical support number is 1-800-816-2237 and they are open 7 days a week on central time. Weeks days they close at 9.00pm central time, and weekends they close at 5.00pm central time.
if the problem is not with acer then you can try the following ;
http://help.yahoo.com/l/us/yahoo/messenger/contactus/index.html?pir=e2joXBJibUnk6jXe6wzjjnga5jNcGq_12_JHeiEXsOOZfKQrR1xJNE0dgpH_eXxa4yAU7tlNumGE_pGddjWK0BPqfjftGw--This is my best effort to provide you the solution, so please rate me accordinly.
Good luck :-)
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