Delete foxuser.dbf/fpt

>I've been working away in FoxPro for the past few days and then this morning, after using it for a couple of very productive hours, I suddenly got this error when I tried to start it up.
>
>Fatal error: Exception code=C0000005 @ 05/25/06 03:28:35 PM.
>
>It gets as far as showing the menu and the various things like the command window and then gives the MSoft error message. It shows as error 1000 in the Windows error log.
>
>There's nothing major I've done this morning to change my PC. Since then I've:
>
>* Checked the registry
>* Virus checked it
>* checked that all the hardware connections are solid inside the PC
>* uninstalled Fox and deleted any stray files and then reinstalled Fox from scratch
>* searched the Internet for possible reasons
>
>So any ideas on areas to look at gratefully received!
>
>Cheers
>
>Mike