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I’ve got one work PC at home that uses gobs of CPU%. It’s a Win7 Machine. I believe a significant portion of the issue was caused by one (or more) of the Windows updates last October - December. In my particular case, I hadn’t used the PC in a few months, so when I fired it up, there were a dozen or so SW (Windows and Office) updates that were “waiting to install” and the windows update services we’re eating up over 50%. The machine was consistently running between 75% and 100%. When I’d move the mouse or drag a window, it would flatline at 100%. Out IT guy helped the installation process by “focusing my computer on the install process”. Not sure what he did, but I believe he ended some processes in Task Manager. Not sure which ones.   i went online and found quite a few discussions about high CPU usage people were having after the 4th quarter Windows and Office updates. Found another article that said a corrupted mouse driver was causing the high CPU usage. Seems there’s a lot of possibilities.    Im a Mac user so I can tell you the safe way to go about correcting things. On a Mac, if you boot up in Safe Mode, it clears out issues. Perhaps on a PC it does something similar.   my work IT guy said it was probably time to upgrade my 8 yr old Win7 pro laptop to a new one. It’s still running at 25% cpu usage just sitting there doing nothing. My 10 yr old work desktop PC running Win7 pro however sits at 5-10% CPU sitting there doing nothing. Seems like the laptop could be “fixed”. 

Check the PC's BIOS set up to see if there are any floppy drives configured.  If there is any an 1.44MB drive listed, change it to 'None'.   I have come across a similar issue before where some older motherboards automatically add a 1.44MB entry if the BIOS CMOS is reset, such as after replacing the CMOS battery.  If a floppy drive is configured and there is no floppy drive connected (which are obsolete anyway), Windows will stutter terribly, especially when opening the file explorer. 

Hi, i just installed windows 7 pro 64bits on a new ssd, replacing the hdd i had. Just after, when i was watching some vídeos i noticed that the image was stuttering too much, went to task mngr and it shows that the CPU is always working, not to 100% but when i move a window or open a vídeo file it peaks. Also, after rebooting the pc, my keyboard died. I have tryed EVERYTHING, from drivers to try another pc... Same result, unknown device. It was working and nothing happened, just rebooted pc. Now i have installed the drivers that where missing but the thing still doesnt work and the stuttering keeps there. I alzó tryed reinstslling win7 on my old hdd, same result. Even unpluged GPU just to make sure it wssnt that, but didnt made a difference. I hace checked temperatures , drivers, ahci, tryed Ultra DMA 6, changing from 1 to 4 cpu's on msconfig... Everything, but cant get rid of the stuttering and CPU peaking. Please help!!!!

Still having same issue.

I believe the poster has moved on.