Un wanted program installed on computer cannot...

Question

my daughter opened an attachment in a e-mail and it downloaded internet antivirus pro on my computer. i looked in add/remove and its not there there is a icon on desk top but it is only for install i cannot find any where to uninstall and i went to the home page of this program and they want to sell me a 90 dollar program. how do i uninstall it keeps kicking me out of everything.