How to install/uninstall AVG
  components?

If you want to install or uninstall AVG components (e-mail plug-in for example), you have to run AVG installation using SETUP.EXE from AVG7 directory (directory with installed AVG) or using a downloaded installation file from Downloads-Programs.

Running the installation process recognises the existence of installed AVG 7.0 and the Add/Remove Components option is offered.

Reinstalling and using the Add/Remove option is necessary for example for the case that there is a new supported e-mail client (Outlook/Eudora/The Bat!) installed on the PC after the installation of AVG 7.0.