If you did use it (it came with your computer?) then surely you have a license to use it as part of that?
Most webcam drivers and their associated software will afford the option to take videos and/or pictures or if you want to up your game it should be able to be used with any half decent capture software-
For video
http://www.virtualdub.org/ is top flight capture freeware, it has lost some ground in recent years as far as video editing goes but for capture it is rock solid.
File pulldown-> capture AVI (down the bottom somewhere), select your device from the device dropdown menu (not sure what your drivers will afford here but you can probably use VFW or your device itself) and you should be able to see whatever it is pointing at, file dropdown-> set capture file.
You have a whole slew of other options (splitting, capture time and more) to play with as you deem necessary.
You can start the capture with f5, f6 or with the relevant button on the capture pulldown menu.
For pictures:
Windows image acquisition- file, "from scanner or camera" in MS paint* or file, create, scanner/camera in GIMP.
*I am first in line to call paint on the shortcomings but save it as a BMP and use a real editing program afterwards.