Thank you all for your help with this.
My problem was with Avira Internet Security 2012.
In preparing to report the problem to Avira, I found a similar Avira-LiberKey problem ("Update of software of an USB key") described in their forum.
My apologies for not checking there sooner.
Some general solutions were suggested there, which helped me to determine what to try.
For anyone experiencing a similar problem, here's what made the problem go away.
I did 2 things to the LiberKey installer program
(file ...\LiberKey\LiberKeyTools\Installer\LkInst.exe):
I went to Avira's "Internet protection->Web Protection" page and clicked on <Configuration>.
From there, I went to "Internet protection->Firewall->Application rules".
On that page, I did an <Add application> for this file (LkInst.exe), and set the Action to "Allow" (rather than "Ask" or "Deny").
From Windows Explorer, I brought up "Properties->Compatability->Privilege Level" for this file (LkInst.exe).
I made sure that "Run this program as an administrator" is checked.
(I don't remember whether this was PREVIOUSLY Checked OR I CHANGED it to Checked.)
I'll post this detailed solution on the Avira forum.
kokbira a écrit:Do you report it to that umbrella corporation (Avira team)?
I'm installing trial to my machine to see it, but it has only an ordinary 32-bit Windows XP...
kokbira a écrit:I'm using trial 2012 version in a Windows XP and all is ok.
Which version of Avira Premium do you use?
The function is called "Web Protection" or "WebGuard"? For me it appears as "Web Protection".
Dji a écrit:rjohnson a écrit:I was wondering, "What does LiberKey do differently?"
To be honest, I don't know but as far as I remember it is due to the "proactive defense" of Avira, this is not mandatory to deactivate the whole antivirus but only this proactive defense