Why does wmiprvse.exe cause CPU usage to jump up to 100%?

Hi everybody,
For some reason, every now and then, wmiprvse.exe is causing my CPU usage to jump up to 100% and I have no idea why!

I Google it, but there seem to be so many conflicting stories. I have run all my virus/spyware programs and there was nothing to report.
Any idea about this?
I am using:
Microsoft Windows XP – home edition
Intel (R)
Pentium (R) 4
CPU 2.8GHz
Waiting for your valuable suggestions.
Thanks.
