fields in reports change on their own

I recently changed one of my computers. It is an HP running XP.  We have been running a particular paradox database for years and started using it on this new computer.  When I go to run a report as soon as I open it paradox changes some of the fields to a date field or sometimes another field.  I go back change the form, save it, it may work one or two times then I might change a filter and presto fields change on their own.  If I run the program on another computer it does not happen.  I have uninstalled paradox twice as well as wordperfect.  even reinstalled word perfect x3 and then upgraded to x4 to see if that had an affect to no avail. I am stumped.  Anyone have any suggestions?