avgnsx.exe is a avgnetscan
belonging to AVG Internet Security
from AVG Technologies CZ, s.r.o.
Non-system processes like avgnsx.exe originate from software you installed on your system. Since most applications store data in your system's registry, it is likely that your registry has suffered fragmentation and accumulated invalid entries which can affect your PC's performance. It is recommended that you
check your registry to identify slowdown issues.