AVG Won ‘t Uninstall – Error Code: 0xC007064C

Hello,
I am using the 2012 addition of AVG anti-virus, but it has become corrupted and stopped working. It will not uninstall every time I try to uninstall AVG.
The following message appear: (Severity: Error, Error code:0xC007064C, Error message: The installation source for this product is not available. Verify that the source exists and that you can access it.
Additional message: An unexpected runtime error occurred. Content: Initialization).
I have also attempted to repair and reinstall but still, nothing. I even used the help section on the website and followed all given instructions but still no joy.
Any ideas how I can solve this??
