I have a logitech webcam like the one shown above, I do not have the cd and I can't find it. can u help me with that?

Visit the Logitech website and browse the photo gallery for your model and click on the photo to navigate to the support page.
Note - Older models on page 2 - look for the link at the bottom right of page 1 and click on it "Still can't find your product?"

http://www.logitech.com/index.cfm/405/&cl=us,en?prodcrid=405

In addition to the Logitech installer you will need to download Microsoft DirectX 9 or later to support your webcam

Procedure
Close all programs while uninstalling - downloading and uploading software
Disconnect your webcam
Uninstall the current webcam software on your computer
Restart computer
Download the Installation package from Logitech
Run the installer and choose your options during the installation - You may not want Logitech Chat but the Desktop icon for the webcam toolbar is a must.
Connect your webcam when prompted.