Sam is right: We obviously need a lot more info to really figure out what can be done within the constraints you are operating under, but to get the conversation going, I'll mention that there are essentially two major ways to do a semi-automated fix of the stairstep (ie, "pixellated") edges. The first is to bring the image into Adobe Illustrator and use its "Image Trace" capability. Unfortunately, one always has to tweak the results, so, although this method is partially automated, it still is quite labor intensive in most cases.
The second method is to use a little known plugin, Power Retouche Pro's "Anti-alias", followed by blurring and thresholding. Once the letters to be improved are selected, this can be made into an action, but at best, the result looks like a lumpy, poorly drawn cartoon from the 1940's, with severe rounding of every corner that is supposed to be sharp (see below). If the final size of each character is small, maybe something like this will be tolerable.
Give us some more info and maybe something else will come to mind.
Tom M