I have a computer loaded with WIndows 7 64bit. Today they complaining about programs not responding. I noticed that the Disk activity was steady at 100% being caused by svchost.exe (locasystemnetworkrestricted). I've ended the process tree but when certain programs are loaded example: Office. that process restarts and the disk activity goes back to 100% and makes the computer unusable.
I ran a diag on HD and it passed.
I uninstalled AV (Symantec) and problem still exists.