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I've had this error a while and I keep looking but can't find a solution.

Problems: - Every time I start my computer it 'Cannot connect to system event notification service'. This means non admin users cant log in and I guess a number of other issues I'm unaware of.
- My CPU performance according to Task Mgr is always 100%. THis can't be right. (Although not in safe mode)
- Also seems to have defaulted my taskbar to Windows classic. And I cant seem to change it back to Aero.

Attempted Solutions: - So far I've installed malwarebytes/spybot and antivirus(avast). - I've done a system restore to before the time it started.

I'm totally stumped. I think either its a complex virus, I've missed something obvious or its a Windows Update or something.

Currently running Windows 7 (home premium). Any advice would be great!

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2 Answers

up vote 1 down vote

What process in task manager is using all the CPU cycles?

Or, open a run command and type in

resmon

this will open a resource monitor, you can see what is hogging cpu cycles.

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According to resmon PresentationFontCache.exe is using 75-80% of my CPU. FontCache3.0.0.0 is also using 50-65% of my services. – whatup Apr 10 '11 at 16:07
i found this which is a temporary solution i think. doesnt seem like the best thing to do.. social.msdn.microsoft.com/Forums/en/wpf/thread/… – whatup Apr 10 '11 at 16:16
Sounds like the font cache was corrupted. Looks like a proper fix to me, be sure to re-enable the Service. – Moab Apr 10 '11 at 16:39
So that solved the fontcache issue. But I seem to be getting blue screen errors and it running slowly. There was a wmdnetwrk.exe running. I have changed that service to disabled. All these things are seemingly randomly started. Is this a dodgy build of Windows 7? It's 7600. – whatup Apr 10 '11 at 20:50
Did these problems start suddenly? – Moab Apr 10 '11 at 21:04
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I had the same saturation problem on my HP Pavilion DV6 and found this answer that worked perfectly for me..

Windows 7 100% CPU usage on H-P Dv6

Anyone experiencing maxed CPU usage by "search protocol host" and/or "permon", "indexing" on a H-P laptop, I suggest returning "Power Management" to "HP Recommended". It seems to cause some "loop" or conflict in the HP software. It is a simple fix, drove me crazy for weeks. But I have since duplicated the 100% cpu usage by another (foolish) attempt to manually manage the power settings. Hope this helps some of you.

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