Thanks for the responses guys.I downloaded servicepack 1a (through windows update) the night before i downloaded GP4PFedit,so that hasn't fixed it (see gav's comment). But be warned Guimengo,with a 56k modem it took nearly 4 hours starting at 1 a.m.(for a faster transfer rate), cos it archives your original files whether you like it or not,and creates a restore point. Will try TeamEditor 1.
Is it possible to play GP4 online with a 56k modem at a realistic speed, or do you need broadband to make it worthwhile? Would be good to play against human opponents,long as they weren't cheating too much on the horses lol.