Tech have you tried the following...
(assuming you have Norton Personal Firewall)
1. D.click firewall icon in sys tray
2. [Console should open up] On 'Status & Settings' click on 'Personal Firewall' - Two options appear - Turn Off & Configure. Click Configure.
3. [New window opens] On the top tabs click 'program control'
4. in the list check the settings for SD Central. It should be 'permit all'. If its not then click once on the name and choose 'permit all' from drop-down list.
Hopefully that should do it. I had the same problem and this sorted it out. If it doesnt let me know 