CPU 50% System Idle Shows 98%

May 9, 2008

I have Vista Home premium for 2 years. About a week ago it slowed to apoint where it may take 5 minutes to respond. Task manager Performance shows about 50% CPU usaage but Processes says 98% idle. If I start in safe mode Task Manager is the same but I seem to get a little better response. I use a free version of AVG.This problem seems to show up a lot in Google but each one seems to get resolved a different way. I tried some things others did but it has had no affect. The last time I started there were about 10 SVCHOST
processes. I ended a few but nothing changed.It takes a long time for one to end because the response is so slow.And it gets slower the longer I am up.

Where do I start to get to the bottom of ths?

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From time to time my system (Vista64) shuts down - when IDLE - for no reason. WIndows restarts and says: Windows recovered for an unexpected shutdown... error report send. How to debug? Note that the system is idle; only background processes are running.

What I've done sofar:
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- Removed all USB sticks (no readyboost anymore)

I leave the system idle and 10minutes to 2hours later; bang; shutdown Note also that the system never chrashed when I'm actually working. So, not a severe issue but I feel intellectually challenged to get the thing under control.

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