Une solution trouvée avec un coup de google, en englais malheureusement, mais c'est pas compliqué:
(C'est bien util google...)
Follow these removal steps to uninstall this program from your computer:
Go to Go to Start > Settings > Control Panel, click Add/Remove Programs. From the list select Error Guard, click Remove or Change to uninstall it.
Delete the folder ErrorGuard under "Program Files" directory.
If the Add/Remove procudure fails, try the following steps to manually remove this spyware:
Click Start > Run, type 'regedit' to open the Registry Editor.
Navigate to the following registry key:
HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ Windows \ CurrentVersion \ Run
In the right pane, delete the value named "ErrorGuard" which points to the file "C:\Program Files\ErrorGuard\ErrorGuard.exe".
Navigate to and delete the following registry key:
O16 - DPF: {205FF73B-CA67-11D5-99DD-444553540006} (CInstall Class) -
http://www.errorguard.com/installation/Install.cab
Reboot the computer.
Delete the following folder and all the content within it:
C:\PROGRAM FILES\ERRORGUARD
Atteindre le savoir, c'est reconnaître le gouffre de son ignorance.