Nt kernel uses 50% of system utilization

As already described in the topic, this service is causing 50% of CPU utilization.
What is causing this and how can I reduce the load?
I use Vista on my laptop

Thank you in advance

Abuse times the Process Explorer from Sysinternals to a few more information.
have you been tested for viruses?

Hi,

post HijackThis log here but it could also be an hardware (drivers) problem.

Is Your PC configuration Enough for VISTA? Because Vista required generally required between 512 mb - 2gb RAM.Depending on your Vista mode.