ProE school edition instalation

Hello, I am having a problem installing the school version of ProE. I was able to download cd1 and cd 2 just fine but when I go to extract the files, it goes extremely slow (15 bytes/sec or so) and then my windows explorer stops working and restarts, which stops the extraction. I have no idea why I'm having this problem because I have no problems downloading cd1 and 2 from the website. I have windows vista and plenty of space on my computer for this program.. any help would be greatly appreciated. thanks