I have never been able to update the antivirus.

As far as I know, I have removed every security package that was on this machine. No PCTools items on it.

It is a Dell machine - anything they put on there that I might immediately know about or think of?

Otherwise, all that I am aware of being on the machine were Norton, Black Ice and Windows Firewall. Other tools were on demand only (No Adaware, DrWeb, MBAM, etc)

In any event, you are reading it as software blocking access to the necessary file on my machine - correct?

Suggestions on how I can ascertain what all might be trying to limit access to files on my machine without taking all day to do?