Updated from Avast 6.0.1035 without problem. Rebooted at prompt and did a Quick scan. All seems fine.
AMD A6-5350M APU with Radeon HD Graphics, 8.0GB RAM, Win7 Pro SP1 64bit, IE11
i7-3610QM 2.3GHZ, 8.0GB Ram, Nvidia GeForce GT 630M 2GB, Win7 Pro SP1 64bit, IE 11
Common to both: AIS 17.3.2291, WinPatrol Plus, SpywareBlaster 5.5, Opera 12.18, Firefox 52.0.2, MBam Free, MCShield, CCleaner