How to prevent a program from stealing focus from you when your trying do do something else, like working in Word or typing an email to someone.

Start > Run > regedit.exe

Go to:
HKEY_CURRENT_USER\Control Panel\Desktop

Edit ForegroundLockTimeout to 0030d40

If you are weary about editing the registry yourself, you can download a pre-made REGISTRY file with the changes in it. Just click here, open the file when prompted, and confirm that you want to merge the file with your computer’s registry.  Firefox users will need to save the download before opening.