DPCs causing 100% processor usage at random times

This has just started happening today, nothing new has been added to my
system and I havent installed ANY new software for a few weeks (except
Windows updates of course).

At random intervals, for periods lasting up to 15mins a process called DPCs
(as shown in Process Explorer) will use 100% of core processing time.
Luckily I have a dual core system so this does not completly hang my
computer, it does however make it painfully slow to use, opening a Windows
explorer window will take anything from 5 seconds to 30 seconds.

I can discern no common trigger for the start of these full load periods,
similarly they stop just as suddenly after a seemingly random period.

A quick Google shows many people with this problem (Deffered Procedure
Calls) but 99% are on XP. Most say it is a hardware issue, but I cannot see
a reason for this, my hardware has been stable and unchaged for many months.
Anyway as a check I removed, cleaned and reseated all components, but the
problem remains as before. Others say it is a temperature related thing, but
my CPU, motherboard and GFX card are well within their acceptable limits.
46, 38 and 51 degrees celcius respectively. I cannot confirm the temperature
of my RAM but to the touch it is much cooler than the cpu, so I don't think
that can be overheating.

What are deffered procedure calls? What events cause them? What would cause
DPCs to use 100% of processor time?

Help!

maybe this helps, also think audio drivers, network adapters, and so on.

http://www.thesycon.de/deu/latency_check.shtml

"sebbelcher" <sebbelcher@discussions.microsoft.com> wrote in message
news:4508C7F7-3F7F-4B2E-9DF1-9DF8E1F9743A@microsoft.com...
> This has just started happening today, nothing new has been added to my
> system and I havent installed ANY new software for a few weeks (except
> Windows updates of course).
>
> At random intervals, for periods lasting up to 15mins a process called
> DPCs
> (as shown in Process Explorer) will use 100% of core processing time.
> Luckily I have a dual core system so this does not completly hang my
> computer, it does however make it painfully slow to use, opening a Windows
> explorer window will take anything from 5 seconds to 30 seconds.
>
> I can discern no common trigger for the start of these full load periods,
> similarly they stop just as suddenly after a seemingly random period.
>
> A quick Google shows many people with this problem (Deffered Procedure
> Calls) but 99% are on XP. Most say it is a hardware issue, but I cannot
> see
> a reason for this, my hardware has been stable and unchaged for many
> months.
> Anyway as a check I removed, cleaned and reseated all components, but the
> problem remains as before. Others say it is a temperature related thing,
> but
> my CPU, motherboard and GFX card are well within their acceptable limits.
> 46, 38 and 51 degrees celcius respectively. I cannot confirm the
> temperature
> of my RAM but to the touch it is much cooler than the cpu, so I don't
> think
> that can be overheating.
>
> What are deffered procedure calls? What events cause them? What would
> cause
> DPCs to use 100% of processor time?
>
> Help!