The webcam for the Dell Vostro 1700 is branded as Creative Labs. The error message above is related to the missing of the drivers for the webcam. However, Windows 7 64bit is not compatible with this device. There is no download on the official website related to Windows 7, but you can use the XP one. Access the drivers page and expand the Mouse, Keyboard & Input Devices (6 files) category. Scroll down and download the Creative Labs driver. Install it, reboot the PC and you should be able to install the driver.
For Dell Webcam Manager, you have to create an account using the My Account (Internet Explorer is required) to perform a SCAN from the member's area. Then the website will automatically provide the necessary downloads for your laptop.