At first I tried installing CS4 Illustrator demo, and couldn't. Then I bought Cs4 Illustrator and it still won't install. I attached a picture of where it always hangs up. I tried uninstalling/removing anything that has the word CS4 or Illustrator from my computer and reinstalling it, but still nothing, any suggestions? P.S. I can't get support from good old Adobe because I didn't buy it from them and I installed Adobe Support Advisor but don't know how to work it.