The Threads sensor has detected a large number of threads (subprocesses) running on the computer.
32-bit applications can break their execution into separate tasks or "threads." This increases the efficiency and speed of these applications by allowing them to perform several tasks simultaneously. However, having too many threads running concurrently can waste memory and degrade system performance.
Close non-essential applications to reduce the number of threads. To find out how many threads each open application is using, open System Information and click the Memory tab.
The trigger level for this sensor's alarm determines what Norton System Doctor considers a "large" number of threads. To change the trigger level, click Change Alarm Settings.