Hi, Newbie to forum 
This issue has been tested on windows 7 pro newbuild and windows 10 newbuild- all are latest builds x64 Pro
Dell Precision 380 3.0Ghz 4GB Ram Kingston SSDnow 300
Currently have 55 of these computers with either windows 7 or 10 installaed, in the progress of updating to W10.
Installation via latest online setup or full version Avast! Free Antivirus 11.2.2262, apparently this version has a fix to stop crashing!!!
while installing avast free on windows 7 I get a blue screen during installation. Safe mode- Remove avast and then it works again.
While installing avast free on windows 10 pro At the last point of installation(Progress bar at end) it simply crashes/Freezes.
This is not the only pc with this spec thats doing this now.
Have also tried an installation of avast business free addition and the same issues happen.
Tried on a hp unit I have as a spare and installtion was fine.
appreciate any help.