Two remarks to start with:
- No need to know anything of foxpro, especially if you're in a office lan. Then your IT-staff should solve the problem, shouldn't they.
- Why do you post in the Windows 95/98 forum, if you have Windows XP and we have a Windows XP forum also?

The problem you meet is a known problem, mentioned in;en-us;137809
There are two solutions:
a) limit the memory to less than 512 Mb
b) upgrade to Foxpro 5.0a or higher

The choice is up to you or the office's IT staff. But they should have been able to find this themselves, if they are a competent IT-staff.