WARNING] The file could not be opened!

Bonjour voici les messages que j'ai pu lire en passant l'antivir. Je ne comprends pas bien..mais j'ai effectivement quelques soucis ces derniers temps. Quelqu'un peut il me dire ce qui ne va pas?
Je vous en remerçie par avance

Starting the file scan:

C:\PAGEFILE.SYS
[WARNING] The file could not be opened!
C:\hiberfil.sys
[WARNING] The file could not be opened!
C:\WINDOWS\system32\config\system.LOG
[WARNING] The file could not be opened!
C:\WINDOWS\system32\config\software.LOG
[WARNING] The file could not be opened!
C:\WINDOWS\system32\config\default.LOG
[WARNING] The file could not be opened!
C:\WINDOWS\system32\config\SECURITY
[WARNING] The file could not be opened!
C:\WINDOWS\system32\config\SAM
[WARNING] The file could not be opened!
C:\WINDOWS\system32\config\SAM.LOG
[WARNING] The file could not be opened!
C:\WINDOWS\system32\config\SECURITY.LOG
[WARNING] The file could not be opened!
C:\WINDOWS\system32\config\SYSTEM
[WARNING] The file could not be opened!
C:\WINDOWS\system32\config\SOFTWARE
[WARNING] The file could not be opened!
C:\WINDOWS\system32\config\DEFAULT
[WARNING] The file could not be opened!
C:\WINDOWS\Temp\ZLT020b2.TMP
[WARNING] The file could not be opened!
C:\Documents and Settings\NetworkService\NTUSER.DAT
[WARNING] The file could not be opened!
C:\Documents and Settings\NetworkService\ntuser.dat.LOG
[WARNING] The file could not be opened!
C:\Documents and Settings\NetworkService\Local Settings\Application Data\Microsoft\Windows\UsrClass.dat
[WARNING] The file could not be opened!
C:\Documents and Settings\NetworkService\Local Settings\Application Data\Microsoft\Windows\UsrClass.dat.LOG
[WARNING] The file could not be opened!
C:\Documents and Settings\LocalService\NTUSER.DAT
[WARNING] The file could not be opened!
C:\Documents and Settings\LocalService\ntuser.dat.LOG
[WARNING] The file could not be opened!
C:\Documents and Settings\LocalService\Local Settings\Application Data\Microsoft\Windows\UsrClass.dat
[WARNING] The file could not be opened!
C:\Documents and Settings\LocalService\Local Settings\Application Data\Microsoft\Windows\UsrClass.dat.LOG
[WARNING] The file could not be opened!
C:\Documents and Settings\pseudo\NTUSER.DAT
[WARNING] The file could not be opened!
C:\Documents and Settings\pseudo\NTUSER.DAT.LOG
[WARNING] The file could not be opened!
C:\Documents and Settings\cata\Local Settings\Application Data\Microsoft\Windows\UsrClass.dat
[WARNING] The file could not be opened!
C:\Documents and Settings\cata\Local Settings\Application Data\Microsoft\Windows\UsrClass.dat.LOG
[WARNING] The file could not be opened!
C:\Documents and Settings\pseudo\Application Data\Mozilla\Firefox\Profiles\tkjwa79y.default\parent.lock
[WARNING] The file could not be opened!

Configuration: XP de windows