After Reinstall, Software Still Not Installed Properly

Here's what you can try.

When installing turn off any firewall first. You can turn it off after the software is installed and running.
If you're using Windows XP and a third party firewall make sure you have Window's built in Firewall turned off as well. You can do this by going to Start >> Control Panel >> Windows Security Center
If you use Norton, customers have reported even though they turned it off, there was still a "Internet Worm Protection" from Norton that remains enabled. Once they disabled that, they managed to install and run the software without problems.