I don't know how to install A4tech PK-635 Web Cam. Please help me because i lost my cd installer

Hi and welcome to FixYa!

No need to worry if you lost the installer. You may download an A4tech driver via internet. On the search box just type downloadable A4tech PK-635 driver and it will give you the list. From there you can save it in your pc and run the program.

Hope this helps and thank you for using FixYa! Have a good one!

Connect the webcam to the computer. Download the drivers from:
http://a4tech.com/product.asp?cid=&scid=&id=233
or
http://a4tech.com/search.asp and choose the model. After that you will see a download driver button.
Install the driver and it should work perfectly.
N.B. The links from above are for PK-635. If you need drivers for other model use the second link or search the model on the site.
If you need further assistance or have further questions, just leave a comment. Thank you for using FixYa
Cheers