We are having some issues with the svchost.exe using 100% CPU.(windows XP)
After some research we have tested deleting HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\SvcHost\NetworkService and it fixes the problem. We are trying to create a .reg file to delete this key and it just doesn't seem to work. Here is the .reg file contents.
Windows Registry Editor Version 5.00