Yee, That´s good if you will block all windows services as:

services.exe
LSASS.exe
svchost.exe
mstask.exe

All other programs may acces to internet. Use antispyware and Antivirus too.
I have been cracked few times and got viruses on my sygate so be carefull and block all porst that you dont need if you know which of them.