Getting an application error from svchost.exe

Hi,
I am getting this error:
svchost.exe — application error the instruction at "0x745f2780" reference memory at "0x00000000". the memory could not be 'read'
When I try to close the error message, Windows restarts. If I just let the error message be (i.e. not interrupt it), the machine stays on. I need a solution from any experts.
Thanks in advance.
