can't install NIS 2012

Hi, Ive just bought NIS 2012 and having major problems. Running windows XP.

Instered the disk and a box pops up saying cannot install. Tried to use the recovery tool and eraser tool but when I click on them a window pops up saying something like 'select program to run this' and repeatedly a box pops up saying 'run' 'save' or 'cancel' I choose run but it asks again etc...... any help appreciated. pls note I am not technical.... thanks.