Yes you can use driver packs, you don’t need to specify which machine that uses which driver.
It works similar to when you manually install a driver and use “search for driver software in this location:”

Read up on sysprep, this will return windows to the setup stage where it can install all drivers automatically. You will need to specify in the sysprep configuration file where it should try to find all drivers that are not included in your installation, this can be a share on a windows machine in your network.

Not sure if I understood your problem, but you did not install DHCP server on the FOG server and you have a windows server that acts as DHCP server. Then you changed your scopes on your windows DHCP server and PXE stopped working?
If so you just need to make sure your new DHCP scopes are configured on the Windows DHCP server, see this for more help on that:
[url]http://www.fogproject.org/wiki/index.php/Modifying_existing_DHCP_server_to_work_with_FOG[/url]

If you dont have dhcp server installed on your FOG server there shoudent be any dhcp config files on it.

Sounds like your PXE menu didn’t get saved, make sure you fill in the “Master password” when your editing anything on the “PXE Boot Menu” page.

Tryed this [url]http://www.fogproject.org/wiki/index.php?title=Installation[/url] ?
And this [url]https://help.ubuntu.com/10.04/serverguide/C/network-configuration.html[/url] for configuring static IP

Yes it is, it copies everything.
Windows and few other applications may require that you activate them again after cloning due to hardware changes.

I have always used “sudo nano -w /var/www/fog/commons/config.php” to edit files without any permission issues.

Are the clients also connected to a gigabit switch? 10min for that size sounds like ~100mbit speeds.
Ive had the exact same issue when imaging a computer lab that had a old switch with only 100mbit ports, replacing it with a switch that had 1000mbit uplink to the rest of the network fixed the issue for me. Tftp traffic seems to take big hit when the network is overloaded.
If everything looks ok make sure the server have negotiated 1000mbit with the switch.

When exactly does it stop?
If its before you can login you can try switching to a different terminal window (by using alt+f1-6) and see if login becomes available.

Should be a script with the installation files files for FOG named FOGBackup.sh, open it in a editor and have a look.
Personally i run a script from crontab to backup my linux servers automatically, first it mounts a remote server and then it compresses the www folder and runs mysqldump to the remote mount.