1 - Open a command shell
2 - In this window use 'sc' to find out the names of the services you want to turn off
3 - Either in this window or in the normal Windows GUI, create a .bat file
4 - In this file for each of the services you want to stop, fill in the following:
NET STOP <service name>
5 - Create a shortcut to this file to your desktop or wherever you want to store it
When the time comes to play a game/see a movie/whatever, use the shortcut or execute the .bat file, which will work always. If you have only one version of Windows in your LAN/set of computers, you can copy this file without problems to each system and it will work as well.
When you need to enable the turned-off services, see the previous mentioned steps and replace step 4 with:
NET START <service name>
If you run multiple versions of Windows, check for each version the services you want to stop and just add them to the previously created files.
Nothing more to it, this solution works always in every version of Windows, from now till kingdom come (darn, one day too late...