Hi John,
Welcome to Microsoft Community and thanks for posting the question.
Based on the description it looks like you are facing an issue with onboard webcam after installing Windows 8 Operating System.
Error Code 28 is caused by a missing driver for that particular hardware.
I would recommend you to install the webcam drives from the manufactures’ website.
Refer: http://support.asus.com/download.aspx?SLanguage=en&p=3&s=87&m=Pro31P&os=&hashedid=n%2fa
Note: If it is compatible with Windows 8 then I would suggest you to install the drives in compatible mode.
What is program compatibility? http://windows.microsoft.com/en-US/windows-8/what-program-compatibility
Make older programs compatible with this version of Windows: http://windows.microsoft.com/en-US/windows-8/older-programs-compatible-version-windows
Hope the information provided is helpful.
If you need any other information about Windows, feel free to post your questions and we will be glad to help.