Office 97 crashing !!

Hi,

I am managing a network of approximately 100 users. We run Win98 and NT4.0 server. We also run office97 across the network. Recently, office97 applications just keep on crashing. At one time we have all 22 machines with illegal operation at the same time. Someone told me the binding on the NT4.0 server needs to be re-applied and others told me it is because of win98. Could somebody suggest the cause of this problem? Thanks !!

Regards,
Edmond