Can not find anything about that problem from a few months.
There is nothing installed on the computer execpt SQL server.
When try to upload something bigger than 1Mb,(no matter if i try to upload something to local area, or attach to email) the LAN card stops working.The monitors in taskbar are displayed connected.But there is NO traffic through NIC(no packets through it).After restart everything is perfect.And if try again upload everything repeats.
Cannot get any messages from eventviewer.
Everything seems ok, but it is not.