You can manage what users use what desktop pc with a group policy, here a a guide on how to setup this GPO to manage users login rights to desktops.
If you are migrating your DHCP service to another server then you will need to backup the DHCP database and then restore it on the new server. Here is how to do so.
Changing the domain administrator is a straight forward job – aslong as you follow the pre-requisites. Here is a step by step guide to changing the administrator password on your network.
How to locate your memory dump file after a crash to see why it crashed, this is usefull in diagnosing blue screen errors.
A quick guide on how to check what server holds the FSMO roles. This can be done qith a little command line utility in windows. Read more.
DHCP client service won’t start – access denied,You cannot connect to the internet or your domain. This is due to the network service account having incorrect permissions, here is how to fix this issue
Your network uses roaming profiles but they take an age to load, speed them up with this guide..How to speed up roaming profiles
If you want to control a pc remotely with RDP you may find that RDP is disabled, all is not lost. Here is a guide on how enable RDP remoteley when it is not enabled.
If you have a service that is left over from and unwanted application install sometimes it will not gracefully remove. we can however remove the service with a registry edit. Here is how.
You can block applications on your network from being run with something called a hash rule, these can be deployed with group policy. Here is a step by step guide on blocking applications on your network.