Hello, I am belgian, and I had the same problem.
I thus put it on read only and it stops growing. But I had send a mail to Avg to ask what it was possible to do further... The answer asked me to make a print screen to understand what I was asking....
Doing this, I readed quickly the text of the "txt" and saw that there was also question of "Firefox".
I use no more Firefox but launched "search" on Firefox, and saw that there stayed on the computer a lot of not deleted parts, that I deleted at once.
And all was away, also "Toolbar_log.txt", and it came not back!
Now, one hour later, everything stays OK!
Thus, try that and telle me what!
AVG is contacted. Wait and see!
I leave my computer on 24/7 because I run a lot of programs in the background (BOINC, etc.). Beginning a few weeks ago, my computer's memory would be so full that I couldn't even close programs. Eventually, I would get a BSOD and the system would reboot. I then used Process Explorer to find the culprit, but it doesn't show any programs using that much memory (over 2 gigs in this case). Eventually I resorted to killing processes 1-by-1 until I saw a huge drop in memory consumption. Of course, the culprit turned out to be vprot.exe.
I checked my toolbar_log.txt file and found that it would grow to over 500 meg in just 7 minutes after boot. Looking at the details of the log file, I think the toolbar app is stuck in some sort of initialization with Firefox. Funny thing is I don't have Firefox installed. Maybe I did at one point (can't recall). Now I only have Chrome and IE.
I'm guessing a lot of people are having these problems and aren't able to track it down to AVG's toolbar, so they aren't able to complain about it. Please elevate the priority of this item!
Note, the log data below repeats over and over every couple seconds.