Ana, You have Windows Firewall running and I'm pretty sure that Norton 360 Premier Edition, has it's own Firewall.
Type (or copy/paste)
services.msc in the start seach box. When the 'gear icon' shows up, click on it to open a new window in services. Scroll down to
Windows Firewall, right click on the item and choose properties.
Now, click on the "startup type" dropdown box, and disable it... then click to stop the service in the upper left hand corner. Scroll down to
Windows Installer and see if it's disabled ... it should be set to manual, and start the service. Norton should be automatically updating.
Also, update Adobe Reader
Download Adobe Reader 11.0.02 - Technical Details - FileHippo.com
Uncheck any pre-checked boxes offering stuff you don't need or want