svchost is a generic service. That is a particular application error. Try to find the faulting application.
You can do this via trial and error using
msconfig |
startup by a process of eliminating particular startup items until the culprit is found.
start > Run... >
msconfig > startup
You might also check your
Event Viewer via
Administrative Tools.
Open the
System as well as
Application tabs and look for red
X errors that coincide with your problem. Details here:
How to view and manage event logs in Event Viewer in Windows XP
