How to install Tecknika VGA webcam?

I too have just bought a Tecknika VGA webcam and headset (model: H16WC-01) and when installing the driver from the CD it gets to the final screen where I should be able to click on finish and I cannot see the screen to click finish. In task manager it appears to be there but there is nothing visible for me to click on to complete the installation, I have tried maximising and minimising from Task manager and there is an odd ghost movement of max & min but still no screen visible. I have tried deleting the folder it created in Program Files (had to delete as no program to uninstall) and tried installing again, the same problem occurred. Even tried downloading the software off Tescos website incase the driver I have is out of date but exactly the same problem occurred.
Any suggestions???