Audit Policy Change

During the past week I have noticed some strange goings-
on, most of which were due to spyware. However, when I log
on now there is a security event that wasn't there before:

Audit Policy Change:
New Policy:
Success Failure
+ + Logon/Logoff
- - Object Access
- - Privilege Use
+ + Account Management
+ + Policy Change
+ + System
- - Detailed Tracking
- - Directory Service Access
+ + Account Logon

Changed By:
User Name: FIELDHOUSE$
Domain Name: MSHOME
Logon ID: (0x0,0x3E7)

Should I be nervous? thx