I've been having the same problem with hardware interrupts on my netbook.
Solutions I found on the internet were referring to either bad SATA cables for the hard disks, or bad IDE/SATA
drivers for the hard disk again.
In general, they were all focusing on the hard disk and ide/sata controller
drivers.
Regarding my netbook, I tried to install chipset/ide
drivers from the manufacturer's download page, but it still kept giving me hardware interrupts CPU usage. Then , after a few days, Windows Update found and installed a new chipset
driver from Intel and the problem was gone.
My suggestions:
1. Check windows update for update chipset drivers if any.
2. If not, manually download and install IDE/SATA controller drivers and chipset drivers for your mobo.