I need a driver for webcam windows 8.1

My crystal ball is broken care to tell us what computer and what web camera you have????

If you have notebook, use driver from notebook vendor.

If you have standalone camera, use driver from webcam vendor.

Report your findings from Device manager.

Some drivers are in install DVD and some drivers may be in Windows Update Catalog server.

Follow recommendation on how to place a question

https://support.microsoft.com/en-us/kb/555375

HTH

Milos