How to stop GoogleUpdate.exe from running on MS Windows.
With task manager, end the GoogleUpdate.exe process.
Run services.msc from a command prompt. Set the googleupdate entries to DISABLED.
Run taskschd.msc from a command prompt. Delete the task.
Start --> Control Panel --> Scheduled Tasks
Delete the task.
Run msconfig from a command prompt.
On the "Startup" tab, uncheck "GoogleUpdate".
With these changes in place, over time the entries will return. Now remove the actual program.
Remove GoogleUpdate.exe from the following paths. Drive letter could be different on your system. If you are administrator, go to your user name.
C:\Documents and Settings\Administrator User Name\Local Settings\Application Data\Google\Update