On my high-DPI Windows system, the Avast application window exceeds the visible area on the screen.
Operating system : Microsoft Windows 7 Professional
OS version : 6.1.7601
Service pack major version : 1
Service pack minor version : 0
Free physical memory : 10569260
Total physical memory : 17052119040
PC manufacturer : TOSHIBA
PC model : PORTEGE R930
CPU : Intel64 Family 6 Model 58 Stepping 9
OS bitness : 64
CPU bitness : 64
BIOS manufacturer : TOSHIBA
BIOS name : Default System BIOS
BIOS version : Version 6.80
Motherboard manufacturer : TOSHIBA
Motherboard product : PORTEGE R930
Motherboard version : Version A0
Display : Intel(R) HD Graphics 4000
Display width : 1024
Display height : 768
DPI : 120