It definitely is adware. Hopefully your adware/spyware software will remove it.
Also Suz, obviously make sure your adware software is up to date with updates etc.
If not, seems you can remove it manually although make sure you backup your registry before making any changes there. (If you're not confident messing around with registry then I'd suggest finding some software that does remove the Zango )
http://www.spyany.com/program/article_adw_rm_Zango.html