Windows XP SP3 With All PatchesAMD Dual CoreSomething is eating 50% of the CPU.I have checked Show process from all users in Task ManagerApplications shows the instance of the IE 8 browser I am using to post this and nothing else.Processes shows System Idle at 97-99% with nothing else shown as using more than a perent or two.Performance shows the CPU at 47-54% most of it on the second core.Networking shows 0% Network Utilitization.How do I find the CPU hog?1 person needs an answerI do too

Process Explorer will be able to show you just about anything and everything."There are only 10 types of people in the world. Those that understand binary, and those that don't." [_1337_Pete_]

Process Expolorer shows roughly 30% of the total CPU (two cors) going to Hardware Interrupts and 20% going to Deferred Procedure calls.When I expand the Interrupts it shows lots of CPU but no I/O. The same is true of DPCs properties.So how do I find out what is doing this?