PC Checkup - An error has occurred

Windows 7 (64 bit) system, AVAST anti-virus, AdAware (w/AdWatchLive), Windows Firewall. As soon as I started PC Checkup I received the following error:

Message:

Can't open block definition file, check server and link!

Hint:

tificps.symantec.com#3453

 

While parsing set 3453

 

Call Stack:

 

Link:

@0

 

There is a "Retry" button but clicking it doesn't work.  I've seen problems where not having a browser open can cause programs to fail so I also started up IE and then tried the "Retry" button.

 

I ran PC Checkup anyway and all 3 functions (Protection, Performance, Virus & Spyware) seemed to work correctly.