I think your computer's audio and video are based on the Intel 845GL chipset.

Generally speaking, drivers are installed very differently in Linux than in
Windows. I'm using a slightly different version of Ubuntu than you are; I would
go to Administration/Hardware Drivers to deal with drivers. Then I would go to
Preferences/Display to change the resolution.

For the sound, at the top-right of the screen is a volume control. Try
right-clicking, then see if there's something set to "mute".

I think your computer has a maximum of 256 MB of memory. I've run Ubuntu with
that much memory, but you might be better off with the Xubuntu variant.