Installshield wont install the programs

[Gameline146]

I have downloaded about 7 different game demos to try. When I go to install them, they will not because after the installshield initiates, the extract or uncompress process begins and essentially it just sits there and doesnt do anything. I go to hit cancel and the window says not responding. Any idea why this happens? I am assuming its an OS thing becuase it does the same on all Installshield programs