Windows Live OneCare report a virus in PortableThunderbird.exe and in ALL Executable files from Portable Apps

Starting today, Microsoft Windows Live OneCare report a virus in PortableThunderbird.exe, and in ALL Executable files from Portable Apps.
I scanned those files with Panda Antivirus and no virus found.

LOG from OneCare (partial):

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Antivirus

07.06.2006 10:49 Windows Live OneCare found a virus on your computer
FileName: G:\_Portable_Apps\PortableVLC_0.8.5\PortableVLC.exe
Temporary local copy: C:\Documents and Settings\All Users\Application Data\Microsoft\MalwareProtection\LocalCopies\PortableVLC.exe
VirusName: TrojanDownloader:Win32/Agent!DE3E
Infection was found by On Access Protection: (ANTIVIRUS_ONACCESS_INFECTED)
Disinfection Result: ANTIVIRUS_ONINFECTION_RESULT_FOUND
Success

07.06.2006 10:49 Windows Live OneCare found a virus on your computer
FileName: C:\Documents and Settings\All Users\Application Data\Microsoft\MalwareProtection\LocalCopies\PortableClamWin.exe
VirusName: TrojanDownloader:Win32/Agent!DE3E
Infection was found by On Access Protection: (ANTIVIRUS_ONACCESS_INFECTED)
Disinfection Result: ANTIVIRUS_ONINFECTION_RESULT_FOUND
Success

07.06.2006 10:49 Windows Live OneCare found a virus on your computer
FileName: C:\Documents and Settings\All Users\Application Data\Microsoft\MalwareProtection\LocalCopies\PortableClamWin.exe
VirusName: TrojanDownloader:Win32/Agent!DE3E
Infection was found by On Access Protection: (ANTIVIRUS_ONACCESS_INFECTED)
Disinfection Result: ANTIVIRUS_ONINFECTION_RESULT_FOUND
Success

07.06.2006 10:49 Windows Live OneCare found a virus on your computer
FileName: G:\_Portable_Apps\PortableClamWin\PortableClamWin.exe
Temporary local copy: C:\Documents and Settings\All Users\Application Data\Microsoft\MalwareProtection\LocalCopies\PortableClamWin.exe
VirusName: TrojanDownloader:Win32/Agent!DE3E
Infection was found by On Access Protection: (ANTIVIRUS_ONACCESS_INFECTED)
Disinfection Result: ANTIVIRUS_ONINFECTION_RESULT_FOUND
Success

07.06.2006 10:49 Windows Live OneCare found a virus on your computer
FileName: C:\Documents and Settings\All Users\Application Data\Microsoft\MalwareProtection\LocalCopies\PortableVLC.exe
VirusName: TrojanDownloader:Win32/Agent!DE3E
Infection was found by On Access Protection: (ANTIVIRUS_ONACCESS_INFECTED)
Disinfection Result: ANTIVIRUS_ONINFECTION_RESULT_FOUND
Success

07.06.2006 10:49 Windows Live OneCare found a virus on your computer
FileName: G:\_Portable_Apps\PortableVLC_0.8.5\PortableVLC.exe
Temporary local copy: C:\Documents and Settings\All Users\Application Data\Microsoft\MalwareProtection\LocalCopies\PortableVLC.exe
VirusName: TrojanDownloader:Win32/Agent!DE3E
Infection was found by On Access Protection: (ANTIVIRUS_ONACCESS_INFECTED)
Disinfection Result: ANTIVIRUS_ONINFECTION_RESULT_FOUND
Success

07.06.2006 10:49 Windows Live OneCare found a virus on your computer
FileName: C:\Documents and Settings\All Users\Application Data\Microsoft\MalwareProtection\LocalCopies\PortableClamWin.exe
VirusName: TrojanDownloader:Win32/Agent!DE3E
Infection was found by On Access Protection: (ANTIVIRUS_ONACCESS_INFECTED)
Disinfection Result: ANTIVIRUS_ONINFECTION_RESULT_FOUND
Success

07.06.2006 10:49 Windows Live OneCare found a virus on your computer
FileName: C:\Documents and Settings\All Users\Application Data\Microsoft\MalwareProtection\LocalCopies\PortableClamWin.exe
VirusName: TrojanDownloader:Win32/Agent!DE3E
Infection was found by On Access Protection: (ANTIVIRUS_ONACCESS_INFECTED)
Disinfection Result: ANTIVIRUS_ONINFECTION_RESULT_FOUND
Success

07.06.2006 10:49 Windows Live OneCare found a virus on your computer
FileName: G:\_Portable_Apps\PortableClamWin\PortableClamWin.exe
Temporary local copy: C:\Documents and Settings\All Users\Application Data\Microsoft\MalwareProtection\LocalCopies\PortableClamWin.exe
VirusName: TrojanDownloader:Win32/Agent!DE3E
Infection was found by On Access Protection: (ANTIVIRUS_ONACCESS_INFECTED)
Disinfection Result: ANTIVIRUS_ONINFECTION_RESULT_FOUND
Success

07.06.2006 10:49 Windows Live OneCare found a virus on your computer
FileName: C:\Documents and Settings\All Users\Application Data\Microsoft\MalwareProtection\LocalCopies\PortableClamWin.exe
VirusName: TrojanDownloader:Win32/Agent!DE3E
Infection was found by On Access Protection: (ANTIVIRUS_ONACCESS_INFECTED)
Disinfection Result: ANTIVIRUS_ONINFECTION_RESULT_FOUND
Success

07.06.2006 10:49 Windows Live OneCare found a virus on your computer
FileName: G:\_Portable_Apps\PortableClamWin\PortableClamWin.exe
Temporary local copy: C:\Documents and Settings\All Users\Application Data\Microsoft\MalwareProtection\LocalCopies\PortableClamWin.exe
VirusName: TrojanDownloader:Win32/Agent!DE3E
Infection was found by On Access Protection: (ANTIVIRUS_ONACCESS_INFECTED)
Disinfection Result: ANTIVIRUS_ONINFECTION_RESULT_FOUND
Success

07.06.2006 10:48 Windows Live OneCare found a virus on your computer
FileName: C:\WINDOWS\Temp\TMP00000011947FD952D5662167
VirusName: TrojanDownloader:Win32/Agent!DE3E
Infection was found by On Access Protection: (ANTIVIRUS_ONACCESS_INFECTED)
Disinfection Result: ANTIVIRUS_ONINFECTION_RESULT_FOUND
Success

07.06.2006 10:48 Windows Live OneCare found a virus on your computer
FileName: C:\Documents and Settings\All Users\Application Data\Microsoft\MalwareProtection\LocalCopies\PortableFileZilla.exe
VirusName: TrojanDownloader:Win32/Agent!DE3E
Infection was found by On Access Protection: (ANTIVIRUS_ONACCESS_INFECTED)
Disinfection Result: Quarantined
Success