Click OK twice to logon.

I have a small network with a NT 4.0 Server running TCP/IP and 30 98SE
clients. Every so often a client will not logon to the network without
pushing enter twice or clicking OK twice. The password turns blue the first
time then logons on the second time. So far if I format the hard drive and
reinstall windows everthing works. I am getting tired of this. Can anybody
point me into the right direction?




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