You need to re-install the Camera Driver after the installation of the Windows 7 Operating System in the computer. As the Windows Vista Drivers are compatible with Windows 7 Operating System, you can try installing those Driver.Please download the Camera Driver here
Please download the file to a folder in the Computer. Then, please open the folder where the files is downloaded and double click on it to begin the installation. Please follow the onscreen instructions to complete the installation process. After installation, restart the Computer for the settings to take the effect.
After that, install the Windows 7 Camera Applications in the Computer. You can download the Windows 7 Camera Applications from the below link.WebCam Companion SoftwareMagic-i Visual Effects Software
Please download and install the Software in the computer. Make sure that you restart the Computer after each installation for the settings to take the effect. Then, please click "Start", "All Programs" and click the "WebCam Companion" to open the Camera Application and use the Camera.
Hope this helps...