Registry Keys Infected

Hello,

I have a problem with my labtop, window XP, i scanned it with Malwarebytes' Anti-Malware and it detects 1 infected object, but when i remove it, it will say the infected object has successfully been removed or deleted. then if i repeat the scan, i will find it again still not been removed. i updated Malwarebytes' Anti-Malware again before i can scan but nothing happen. please help, below is the scan log after scanning.

Malwarebytes' Anti-Malware 1.30
Database version: 1355
Windows 5.1.2600 Service Pack 2

02/11/2008 14:50:11
mbam-log-2008-11-02 (14-50-04).txt

Scan type: Quick Scan
Objects scanned: 69681
Time elapsed: 11 minute(s), 12 second(s)

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

Memory Processes Infected:
(No malicious items detected)

Memory Modules Infected:
(No malicious items detected)

Registry Keys Infected:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\{28abc5c0-4fcb-11cf-aax5-21cx1c642131} (Trojan.Agent) -> No action taken.

Registry Values Infected:
(No malicious items detected)

Registry Data Items Infected:
(No malicious items detected)

Folders Infected:
(No malicious items detected)

Files Infected:
(No malicious items detected)

I clicked remove infected object, but when i repeat the scan, the infected object is still not been removed.