Generally, its yours or the camera's fault that your pictures get buggered. Occaisonally it is the proccesing, and i am afraid you don't pay for what you get for.
My advice is go somewhere, that have experience, i used to go too a photoshop where i could get it 1 hour, and they were useless..
Now i use Kodachrome so i send them directly to Kodak, and the reason i use kodachrome is that it is actually CHEAPER for me to use it than Print Film (even Kodak Gold the Film cost £3, the processing £5, whereas the Kodachrome cost £5 inc processing).
Try Boots, they are usually pretty good.