I don't have any idea what IM client would I use in Ubuntu 9.10. And how do I access the webcam in the Acer Aspire laptop. Do I need any drivers for this one? I've tried to install XP on virtual box in Ubuntu. But the webcam isn't accessible when I use yahoo. What do I do?
As a general advise I'd suggest you to take a look at Ubuntu's documentation about webcams.
You may well have Cheese already installed. Otherwise:
sudo apt-get install cheese