LAN speed very slow and Network drives problem

Hello,
I have speed issues when working with files on the LAN network. They open and save much much slower than XP. On the other hand the ADSL internet connection is fine and running at full speed. What is the problem? The computer is brand new and with fresh install of Windows 7 x64.

My other problem is with mapped network drives. On the second computer, which is running fresh install of Windows 7 too, we have mapped network drives which are accessable on the whole network. The problem is that every time we start that PC with the mapped network drives Windows says "Could not reconnect all network drives" and all computers on the network show them with red "x" on the icons. I want them to automatically open at startup.

I would probably create a startup .bat file for all machines on the network.

Code:

z: /persistent:yes \servername\share

You can copy that into a notepad, then save it as a .bat file. Put it in your public startup folder and it will auto connect on startup.

Ok, thanks! I'll try it out and tell you the results.
And what about the LAN speed? Any suggestions?