This is a little problem that I noticed today and managed to resolve quite quickly and I thought that I would share it with you should you encounter the same issue. I you are using Office 2007 and AVG and encounter any of the issues/errors below then it would be that AVG is causing them.
Bare in mind however this is not a usual with AVG and I only came over these problems because an update on AVG went wrong and made a mess.
Ok these are the errors you might receive:
Outlook 2007
The Addin “AVG Exchange Extension” cannot be loaded
Failed to initialize
Outlook may also not respond and give you the usual “Outlook has encountered an error and needs to close”
Word 2007
The file “File Name” is not available (File Name will be replaced with the name of the file you are trying to open)
Word may also not respond and give you the usual “Word has encountered an error and needs to close”
You might notice that Word is displaying Running Virus Scan in the bottom left of the window where the word count usually is, which is part of the problem. If AVG cant scan a file then its in a way treated as a bad file and you are unable to open again or even use the programs that AVG is linked into.
Don’t worry to much, because this is very easily solved by Uninstalling and Reinstalling AVG. When you Uninstall AVG you will need to reboot (Restart) your computer, then once you are back up again you can download and reinstall the application. I’m under the impression that you know how to do this since you all ready had AVG on your system, if you are unsure on this leave a comment and I’ll explain how and were to get AVG.
So If AVG spits its dummy out and makes your Office pack malfunction you know what to do 
