Why have you saved the scanned document into GIF at first place.
MS Office 2003 comes with sw that converts TIFF,Bitmaps picture into text.
You can also use OmniPage, Basically you need OCR software
As file format is GIF, convert GIF into TIFF. During conversion you may not get good quality TIFF file, so there might be problem in conversion into text.
You can try