Dear sir or madam

I have a network with win nt4 server and 30 win 2000 clientes ,my problem is :sometimes my network becomes very slow even the clients work localy I mean (they work on their own PC with graphic applicationes such as corel draw and photo shope and their hard disk) and do not work with network but occasionally the network icon which is on the task bar is on , they can see each other and shair file as well and send and resive file .
I don't know way the client become slow even when they don't work with network ,and sometimes when they log on for th first time in the morning inorder to start working they have got problem until they log off and log on again and in event viewer of win 2000 ,there is errore which is generate form net logon service.


You will kind enough if tell me how to solve the problem.
Thanks un advance.
;D

Well first id  like to say windows (especily 9x / me and NT) are stupid and are slow as hell when it comes to networking any way, NT 4 server with win2k clients, I've never hurd of such insanity in my life, any way, hmm... slow network, well there are a few questions I have first
1. Are you using HUB's or Switches
2. Is there any spacific time it's slow (like when lots of people try to logon at once)
3. Do the clients have automatic windows update on?
4. Is the server (iv never known a server to have one of theas but then of cousre I've never hurd of a network that uses NT server with 2k clients) running any kind of firewall?
5. are all the HUB/Switch connections working problerly (like is there and data loss at all? If you don't know you can probably start by testing the connections by using large packet sizes with the ping command)