Editing a .dbf table - find and replace attributes

Hello All,

I have a .dbf table created in ESRI's UK Productivity Suite - it's simply a table to point to raster files of base mapping, with a field containing the file path to .tif files, an OID field and fields for xmin, ymin, xmax, ymax. My problem is that I want to find and replace the file path with a different path. I have tried this in ArcMap but the file locks and isn't editable. I can't even think what Transformer I need to do a find and replace of text! I'm sorry - it's Friday and I'm very tired..... I'd be very grateful if anyone is able to help.

Many thanks, Jane