Strange driver problem...

Hi, During hard working on a project my anti-virus gifted me a problem...

I just connected Arduino back to pc and anti-virus blocked it (Avira), I can't find the virtual port which previously existed on IDE. It also disappeared from windows xp control panel devices list.

Next I disabled anti-virus, even uninstalled and reinstalled FTDI driver (got the last update setup exe from their web site) and having anti-v. disabled with protection, again connected Arduino, no detection.

I remember that a.v. reported that blocked something like arduino*inf but I also failed to find anything like that in the blocked-list of a.v.

Could you please point me to the right place to check why IDE can't request FTDI driver service on USB connection like before?