system
6
Thanks a lot wlk, It works just fine with this :
[WebScanner]
AutoRedirect=1
HttpRedirectPort=80
IgnoreProcess=avast.setup,java.exe
LoadIsapiFilters=1
ISAPIFilter1=ashWsFtr.dll
IgnoreAddress=
IgnoreLocalhost=1
The only small drawback is that all java programs (the ones launched with the launcher at least) will have direct access to the port 80, but it’s no big deal at all.
And I used the POP3 protocol to test the transparency of the web proxy because I had a server at hand 
Thanks again for this great product and support.
Kiks.