Norton not detecting virus that is there winupdate.exe and task manager blockage

So I clicked on a banner by accident and Norton first gave me this notification.....

 

 

Auto Protect has detected Trojan.Malscript!html   BLocked no action requried

 

and then

 

I got

 

Winupdate.exe detected by SONAR   and it was removed

 

 

What is the difference between Sonar and auto protect?

 

So after all this I coudln't get into task manager or change the wallpaper

 

So I ran full scan and it found nothing, I then ran Malwarebytes and it found

 

 

Malwarebytes' Anti-Malware 1.40
Database version: 2631
Windows 5.1.2600 Service Pack 3

8/15/2009 10:09:59 PM
mbam-log-2009-08-15 (22-09-59).txt

Scan type: Full Scan (C:\|D:\|)
Objects scanned: 164249
Time elapsed: 1 hour(s), 54 minute(s), 59 second(s)

Memory Processes Infected: 0
Memory Modules Infected: 0
Registry Keys Infected: 0
Registry Values Infected: 1
Registry Data Items Infected: 7
Folders Infected: 0
Files Infected: 2

Memory Processes Infected:
(No malicious items detected)

Memory Modules Infected:
(No malicious items detected)

Registry Keys Infected:
(No malicious items detected)

Registry Values Infected:
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Internet Explorer\Desktop\General\wallpaper (Hijack.Wallpaper) -> Quarantined and deleted successfully.

Registry Data Items Infected:
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\ActiveDesktop\NoChangingWallpaper (Hijack.DisplayProperties) -> Bad: (1) Good: (0) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\NoActiveDesktopChanges (Hijack.DisplayProperties) -> Bad: (1) Good: (0) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\NoSetActiveDesktop (Hijack.DisplayProperties) -> Bad: (1) Good: (0) -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\activedesktop\NoChangingWallpaper (Hijack.DisplayProperties) -> Bad: (1) Good: (0) -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\NoActiveDesktopChanges (Hijack.DisplayProperties) -> Bad: (1) Good: (0) -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\NoSetActiveDesktop (Hijack.DisplayProperties) -> Bad: (1) Good: (0) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\DisableTaskMgr (Hijack.TaskManager) -> Bad: (1) Good: (0) -> Quarantined and deleted successfully.

Folders Infected:
(No malicious items detected)

Files Infected:
C:\Documents and Settings\All Users\Application Data\Norton\{0C55C096-0F1D-4F28-AAA2-85EF591126E7}\Norton\BASH\Clone\BHC5B.tmp (Trojan.Dropper) -> Quarantined and deleted successfully.
C:\Documents and Settings\John Tasinas\Local Settings\Temp\c.exe (Trojan.Dropper) -> Quarantined and deleted successfully.

 

 

 

 

 

System is fine now but why didnt norton fix my issues?