isass.exe is registered as the Optix.Pro virus which carries the ability to disable firewalls and local security protections, and a backdoor capability in its payload.
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Non-system processes like isass.exe originate from software you installed on your system. Since most applications store data in your system's registry, it is likely that over time your registry suffers fragmentation and accumulates invalid entries which can affect your PC's performance. It is recommended that you check your registry to identify slowdown issues