I built my parents computer a few years back and it had XP on it. It has now been upgraded to windows 7 Ultimate 64-bit. It has been running into a strange issue that I have been unable to nail down. It will run ridiculously slow and be choppy, unresponsive, and overall not that great. It is bothersome because I am running the exact same core 2 duo e6750 proc in my own computer. They have an Intel DG33BU mobo with 6 GB of kingston RAM in it. There are 2x2GB and 2x1GB in it. It's an integrated graphics mobo. There are three hard drives, 2 SATA drives and one IDE drive (just disconnected it).
The processor will frequently run at 70-100 % usage but there are no processes to explain the cpu usage. here's an example of what I'm getting at.
That is just a capture of a minute moment of this behavior, but it is happening almost constantly. I had tried to find someone experiencing similar issues, and I was able to find a site that had a microsoft person helping out. they had them use some windows performance toolkit to diagnose what was being sent to the processor. I followed those instructions and I came up with this result.
It showed many calls to the ata and ide as well as the hal.dll. I don't know what all that means and what in particular was being called. However, I suspected that the old IDE hard drive was part of the problem and so I shut down the comp, unplugged that one, and it isn't doing this behavior constantly anymore. But if I fire up anything, the amount of CPU being used is always more than what the process list can tell me is being accounted for. My own computer does not have this problem and I run the same processor as they do. I have guessed the mobo as the problem, or some setting on the mobo, or some way that the OS is communicating with the hardware to be at fault here. The SATA drives are set up to run in IDE mode as opposed to AHCI, while mine are in AHCI. (dad installed windows 7 without consulting me first...) I wouldn't suspect this to be a great hindrance though, but just so it is noted.
So... I am baffled as to why this computer will have such unusually high CPU usage when there are not programs to account for that. Anyone have any ideas?