keytool.exe is a process associated with Java(TM) 2 Platform Standard Edition 5.0 Update 5 from Sun Microsystems, Inc..
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Non-system processes like keytool.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