Run the installation file that you have downloaded from MyTeamVoice download page.
If you saw a window with security warning -- make sure that software publisher is MyTeamVoice Inc.
Choose UI language.
Follow instructions of installation wizard.
On first run go through setup wizard, it is important.
Same video on out site: http://myteamvoice.com/help/pc_client_install
Visit out web site: http://myteamvoice.com/