Most of the applications will load, but after a short while the message as mentioned earlier but with a different file name given appears and then the application stops working.
The above has not worked and most of the applications are still not working the following message is shown in all cases:
"The application *application name* (process.*file details*.) has stopped working. Please Try Again. Force Close"
Samsung Galaxy S GT-19000
Thank you very much for your help, not the solution I was hoping for, but the phone is now working.