Hi, I have been reading some threads here about Appguard. I have a XP Home System and Win7 starter Edition I'd like to protect. On both machines, Avast 6 free is installed, that offers some kind of malware protection (it stops for example executables from USB sticks). Do I need also Appguard and do both work fine together ? I don't like much BSOD... Thanks for your advice(s).