Thank you first of all for having responded.
On the two PCs, avast end point was already installed ...., no longer managed by avst.
I have installed EP and installed the agent for the new one. As I said in the other post, the installation took a long time. When the PC restarted I saw that there were no data in the user profile. All installed programs were no longer executed, including office2010.
To try to resolve I have unmounted avast. At the next reboot, windows would not start giving me only blue screens.
I state that this problem I had encountered a month ago from another customer after having installed avast. I thought it depended on a virus in the system. Instead in this case the machines were clean. It is not the first time that avast combines trouble, especially on business versions, so much so that I decided to switch to another product. Meanwhile I have to recover the data to my client that was there before I installed the antivirus. I reported the problem to the support, through my distributor, but to date not yet had news. To the damage also the prank ....!