Troubleshoot:
Make sure your anti-virus and firewalls are disabled while trying to connect to minecraft.net (while logging in, connecting to a server)
Uninstall Java, then delete your .techniclauncher folder.
Restart your computer (it's not required, but it never hurts to give it a break, and it completely deletes the files)
Reinstall the correct version of Java for your computer (ensure the bit type matches)
Redownload the Launcher.
Try to run the .exe, if this does not work, look in your .techniclauncher folder, make sure you have a .jar file in there.