FIXED THE PROBLEM!!!! it was actualy realy easy go into your %appdata% folder then delete your .techniclauncher folder then scroll down there should be a technic.JAR file delete that too then restart technic and it should work (worked for me no less than 5 seconds ago)
i have the exact same issue and i don't have Norton i have tired re-downloading and that doesn't work either it was working earlier today but now it wont please help (sry for invading ur post but i thought it may help if you still cant get it to work either)