I would check the anti-virus software and perhaps the firewall on both the server and workstations.

>Yes, no problem with Log of sql and windows,
>The problem happens when several user work at the same time looking for data, then I make a query in sqlserver table and is very very slow
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>>Did you check SQL Server log and Windows event logs for problems with SQL Server?
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>>>Hi, i have a database with 1.8gb storage ,i have 4 user working together at the same time, inserting, updating and printing data, when their are woring the database disconect, and to work again i have to restar de sql services....
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>>>1. i use vp9 sp2
>>>2. sql standard edition 2005
>>>3. windows server2003 sp1 (standar edition) (2.8 ghz, 2gb ram)
>>>
>>>???