I dont have software of discovery web digital camera dcm-2602

Hello!
Try this one:
http://xpdrivers.com/camera/_1_4.cfm
Download, then connect your camera to computer, run installation;
When installation done, disconnect the camera and restart computer.
Connect the camera again-it should work now.

NOTE:
If there was a driver for that camera previously installed, please uninstall it before installing the above. Follow these steps:
1. Go to the control panel
2. Click on the System Icon
3. Click on the Hardware Tab
4. Click on the Device Manager then
5. Select the Unknown Device or printer device where yellow Question Marks sign on it.
6. Right click on it and uninstall it.
7. Restart your computer.
Now you can perform the steps for installing from above.

Hope it helps!
Regards!