Registered here even as I run XP, just to say I have exactly the same issue with XP32 on a HP 8510w. The more tests I run, the more I think it could be a hardware issue.
I already disabled most processes, rebooted in in safe mode and disabled all I could from the remaining processes, remastered my machine twice on different masters, and even changed the battery, all to no avail.
There is in my case another point I didn't see mentionned in earlier posts : when docked, everything is fine, the machine charges up and CPU is normal. When unplugged, CPU is normal. When plugged through charger, CPU is 100% and machine crawling, but also it doesn't charge up. Even when on standby or shut down, it doesn't charge up when plugged. I discovered this fact just now, and to me it may point to the charger.
In last resort, the 3 last tests I can ll do are :
- Change the charger as my latest thoughts point to it,
- Upgrade the BIOS in hope there is a fix within a newer version,
- Remaster using XP64 to see if it is related to a 32-bits driver
Then if nothing works I'll have to change machine.