Aldon, The opening FoxPro error message could be caused by a faster computer than what the origial program was made for. This would not cause the data error. Just click ingnore to use the program. There is a FoxPro patch to slow down the startup of the program. The startup is what causes the error.
I would suggest that you go to Utilities > Project > Pack. This will rid your database of all unused bits of data that you have deleted. (When you delecte a event or person they are gone from view but still in the database.) Pack cleans this old data out. Sometimes this old data pops up in unexpected places.