I have installed DefenseWall Firewall on a new Windows XP box I built. I haven't used this box much but I've had a couple of problems installing software which I thought might be attributable to DFW. I attempted to install KeyScrambler (Firefox Add-on) leaving everything at default which was untrusted and it would not install. I also attempted to install the driver for my Canon Lide 20 Scanner, again leaving everything at default which was again untrusted, and I again had a problem. I did not troubleshoot this problem but I later read in a forum of someone who did most installs as "trusted." Should I be able to install software (Keyscrambler and Canon driver) at the default settings of untrusted? I assumed this should work but it didn't in these two instances.