Thanks again Eddy… and also to Ginblossom.

Your suggestions were already under control (and I have plenty of disk space). But… I still have the problem. It is very puzzeling that it doesn’t work even if I pause or terminate Avast but it works as soon as I remove Avast from the computer.

Trying to solve the problem, I ran a File and Registry Monitor. On idle, with Avast running, the Registry access are rare and normal. The File access are going crazy: Avast4.ini and avast4.mbd are accessed several time a second by ashServ.exe (which I guess is normal for an antivirus as my CPU proccess time remain to 0%). Please note that I have desactivated the Virtual recovery database.

When I stop the “Avast resident protection” (literal translation from French, I hope it make sence to you), the File accessing diminishes but doesn’t stop completly (come down to maybe 10 times per second).

With my limited knowledge of the under work of an AV, I see only two leads:
1- Avast changes a DLL file or something else that cause the problem with IE. Remember that when I remove Avast, everything get back to normal.
2- ashServ.exe clearly continue to run in the background even if Avast is stopped. Maybe it interferes with something.

Is this hopeless (one of these things)?

Best regards,
Symont