go into your roaming/.techniclauncher then go into your tekkit folder BAckup your saves if you want, then delete the tekkit folder in .techniclauncher then delete the technic launcher NOT THE FOLDER THE EXE Once you have done that goto the tekkit website and redownload the technic launcher and run tekkit on it... it will re install tekkit. onces its done close tekkit then copy your saves back. It worked for me...