My imac on OS 10.5.8 is showing near 100% processor usage most of the time. It appeasrs that process SystemUIServer is the culprit using 70% or more of processor time. What does anyone think is causing this ?

My imac on OS 10.5.8 is showing near 100% processor usage most of the time. It appeasrs that process SystemUIServer is the culprit using 70% or more of processor time. What does anyone think is causing this ?
What is the purpose of the UIServer module ?
Is there a good place to learn about the OS modules ?

Useful information from BDAqua in this thread:
https://discussions.apple.com/message/22676167#22676167

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