File Access question - 98 & xp

Hello All,

I have 2 machines one has XP Pro and an another has 98 installed. They also
has QuickBook to do some accounting functions.

The quick book file (about 60 mb) is saved in the 98 machine but in most of
the the time it is used by the XP machine. For some unknown reason the file
corruped about twice a week and the user lost their data after the crash.

I'm thinking it may be the network problem (due to data lost thru LAN - just
guessing)... so I tried to copy the file from 98 to XP. It works fine on XP
but when I tried to open it from 98 I got an "Access Denied" error message -
I can map the network drive succesfully and I can see the folder(shared)

I'm not very good in the network admin and there's no one can help me around
the office, if you have any advice(both QuickBook and windows error) for me
please feel free to let me know, I
would be very appreciated!

Thanks~

K.K.