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Try this:

http://askubuntu.com/questions/82724/aspire-one-freezing-due-to-network

I don't but try
Control+alt+T to go in to terminal and type in lsusb
see what it says - It might give you an idea where to go

):P

Try here - http://ubuntuforums.org/showthread.php?p=12393918#post12393918

Then after all that, reboot a couple of times

Have a look here http://ubuntuforums.org/showthread.php?t=1691170

Might help you with your web cam

Wow. Worked for me too. Brilliant. Thank you so much :D