You bought Dell Vostro 1015 with FreeDos or Ubuntu.
Then you installed Windows 7 without getting Dell drivers?
Is anything besides the webcam not working?
However, there's no such thing in Windows Vista 32 bit, or Windows 7 32 bit category. Which means that either it is already included and should work out of the box (doesn't seem to be the situation here), or Windows update should come up with it.
Like you used to say: Update a driver for hardware that isn't working properly