acdaemon.exe is a ArcSoft Connect Daemon belonging to ArcSoft Connect from ArcSoft Inc.
acdaemon is associated with digital imaging and video software, for cameras, printers, scanners, mobile phones etc. it's usually located in the c:/program files/common files directory. if you find it under the windows, windows/system, or the windows/system32 directory it may be malware so it is always good to run a virus/malware scan.
The process when safe is essential for the correct operation of the hardware in question so it should not be removed.
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Non-system processes like acdaemon.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