Lost my volume control

Hello,
i can not find the volume control on my computer. we recentlyinstalled windows xp and downloaded some progams. basically when i go start menu, contol panel, audio and media devices, and try to show the volume controll in the task bar and am then prompted with a message that says i need to install the volume controller. I try to add the program and it dose not have one now. i know that i did before. can someone tell me where i can find a new volume controller on the net. or how i could find my volume contole for the task bar? thanck you