i work with and IT firm and we recently installed windows vista business 32bit on a network that was running windows 2000.(new network). after installing it it ran good for the first 2 weeks and for the last week we get calls that no one can login,sometimes it takes forever to login. i logged into the server and observed that the the cpu usage is fine. that is, when noone is logged in.if 18 users attempt to login at once on the vista machines the server CPU usage spikes to high levels (even less). and slow down and sometimes freezes.
the only things that are different from old network is that we use avg9 network edition
but that seems not to be the problem.
What can it be?
Server is Running 2003 R2 Standard Edition.
Space is not an issue (hard disk)Memory is usage is fine. GIGABIT switches & NICS also. Server workes fine before. NO printers on network.
URGENTLY RESPONSE NEEDED!