Hi, I'mCustomer Welcome to JustAnswer. I'm reviewing your question now, and will post back with your reply ASAP.
What is the version of your Windows OS please ?
First try to turn off your Antivirus and your Firewall then restart your computer and check.
let me know the results
If you still getting the error message, open Task manager (click start, write Task manager and click on it). In the Applications tab, select the 'Server Busy' program, right-click and select 'end process' If the problem still persists try to uninstall dreamweaver CS4 through Windows Add/Remove Programs.
Restart you computer then download it gain and test.
Has everything worked out, do you still need help please?